SeaSources.net, Training for Mariners. The First with Online Study for the Maritime Industry.

  Welcome to Seasources.net. Established in 1996, we are the ultimate source for online USCG exam preparation assistance. Seasources.net provides free online exam preparation along with downloadable studyguides and standalone software that allows you to continue your studies without an internet connection.

 

Prepare for or supplement your studies for your USCG license exam here. 

Click here to register and begin your exam preparations with SeaSources.

We have a new website! It's phone / tablet friendly and speedier. Please visit it today! 

All of the latest questions and illustrations on "Steam Plants I " are in the Online Study.

Home Page       Exam Question Downloads    Download TesTTaker Software    Free Sample Downloads   Maritime Links     Member Comments      Contact SeaSources  Gas Turbine Plants

 

1 When the boiling temperature of a steam boiler is increased,  which of the following effects will occur with relation to the pressure and the specific volume of the steam? The steam pressure and specific volume will remain constant. The steam pressure will increase and the specific volume will remain constant. The steam pressure will remain constant and the specific volume will increase. The steam pressure will increase and the specific volume will decrease.
2 46 CFR requires that                     . the OCMI be notified of repairs to  boilers and unfired pressure vessels the fuel burned in boilers of tank ships shall have a flash  point of not less than 140F a half-pint sample of each load of fuel be drawn and sealed at the time of supply and preserved until that fuel is exhausted all of the above
3 A badly warped boiler water tube can be reworked and bent back into shape by                     .  I. heating it with a torch and reforming it with a soft mallet II. cold pressing it back into shape with a hydraulic jack I only II only Both I and II Neither I nor II
4 A basic comparison can be made between a low pressure evaporator operation and a main condenser with regards to the removal of non-condensable gases. The vacuum drag line for the main condenser is specifically connected in which area? main tube bank steam lane air cooler section hot well
5 A boiler accumulation test is used to measure the                     . lifting pressure of the boiler safety valves total relieving capacity of the boiler safety valves steam generating capacity of the boiler blow down pressure of the boiler
6 A boiler desuperheater is installed in high pressure boilers to                     .  I. maintain flow through the superheater II. raise the steam temperature in the steam drum I only II only Both I and II Neither I nor II
7 A boiler economizer should be bypassed whenever the               . temperature of the stack gas is low enough to reach dew point superheater outlet temperature is too high DC heater outlet temperature is too high main turbine is operating at half power
8 A boiler feed stop-check valve would be located at the                     . boiler water drum first stage feed water heater outlet DC heater outlet economizer inlet
9 A boiler feed stop-valve must be mounted                     . between the feed check valve and the boiler drum between the feed pump and the feed check valve upstream of the feed water regulator at or near the engine room operating platform
10 A boiler fitting used to protect the superheater and to provide reduced temperature steam for use by auxiliaries is the                     . reducing station feed water injector desuperheater dry pipe
11 A boiler has a steam delivery capacity of 100,000 pounds per hour, and is equipped with four steam atomizing burners.  If the load range of the burners is 4 to 1, this means that                     . the boiler may be operated down to 25,000 pounds per hour without securing any burners the boiler may be operated down to 25,000 pounds per hour only after three burners are secured if two burners are operating, steam output will be a minimum of 50,000 pounds per hour all four burners combined can supply up to 400,000 pounds of steam per hour
12 A boiler internal feed pipe is perforated to                     . provide positive downward circulation at high loads distribute the feed water throughout the steam drum reduce back pressure in the feed water piping reduce the overall weight of the drum internals
13 A boiler internal feed pipe is perforated to                     . provide positive flow to the downcomers create a slight turbulence in the steam drum distribute water evenly throughout the steam drum reduce the weight of the steam drum internals
14 A boiler is to be secured in port.  After the burners have been secured, the forced draft fan and air registers should be secured                     . immediately after carrying out the former procedures after any oil on the furnace floor has been burned off and  cleared of combustion gases after 30 minutes has elapsed, after carrying out these procedures after at least 1 hour has elapsed, after carrying out these securing procedures
15 A boiler safety valve must be capable of                     . remaining open until all pressure in the steam drum is relieved remaining open until a preset pressure drop occurs opening gradually above a designated pressure closing with a chattering motion to free scale deposits from the seats
16 A boiler superheater safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of                     . 450 psi (3102 kPa) 455 psi (3137 kPa) 460 psi (3171 kPa) 465 psi (3206 kPa)
17 A boiler superheater support tube differs from a standard generating tube in that the                     . direction of flow of the steam and water mixtures differ metals from which they are fabricated differ outside diameters and wall thicknesses differ method of heat transfer in the tube differs
18 A boiler water sample being collected for analysis should be circulated through a cooling coil because                   . this keeps the water from flashing into steam as it is drawn from the higher pressure of the boiler into atmospheric conditions it reduces the amount of suspended matter that frequently finds its way into the dead end lines the cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify the degree of acidity as measured on the pH recorder is amplified by cool water temperatures
19 A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour.  If the feed water concentration of solids was initially 0.5 PPM, and will increase at a rate of 1.5 ppm every hour, what would be the increase in the feed water concentration of solids after 24 hours? 12 ppm 24 ppm 36 ppm 48 ppm
20 A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour.  If the feed water quality is 0.5 ppm, the concentration of solids will increase 1.5 ppm every hour.  What would be the increase in the concentration of solids within 24 hours? 12 ppm 24 ppm 36 ppm 48 ppm
21 A burner atomizer improperly positioned in the distance piece, may cause                     . oil impingement on furnace walls slag formation on the screen tubes erosion of the screen tube baffles the ends of the flame, farthest from the atomizers, to be a yellowish orange, or golden shade
22 A cause of high superheater outlet temperature is                   , high feed water temperature low feed water temperature excessive fuel oil temperature at the settlers insufficient excess air
23 A check valve is located between the economizer and the steam drum to                     . assure a positive feed water flow through the economizer assure a positive feed water flow to the steam drum prevent the feed pump from becoming vapor bound prevent steam and water flow reversal from the drum  should an economizer casualty occur
24 A chemical based analysis of boiler stack gases is taken to                     . determine the volume of the SO2 products of combustion estimate the amount of noncombustible solids present in fuel oil estimate the BTU content of a quantity of fuel oil measure the percentage volume of CO2
25 A combustion control system diaphragm type air flow transmitter receives its high pressure signal from the boiler                     . fan discharge windbox furnace smoke box
26 A combustion control system, diaphragm-type, air volume regulator receives its low pressure signal from the boiler                     . windbox casing furnace smoke pipe
27 A common gas dissolved in water contributing to the greatest amount of corrosion in a condensate system is                     . carbon dioxide hydrogen carbon monoxide nitrogen
28 A condensate recirculating line is provided to the main condenser in a closed feed water system to                     . prevent excessively cooled distillate from entering the DC heater provide adequate cooling water to the air ejector inter and after condensers assure a positive flow through the main feed pump prevent flashing in the main feed pump
29 A contaminated steam generator is used to produce saturated vapor from collected                     . bilge water sanitary water fuel oil heating return drains condenser cooling water
30 A continuous blow is used to                     . regulate the density or salinity of boiler water remove scum from the surface of boiler water permit air to escape while raising steam in a cold boiler remove sludge from the bottom of the water drum
31 A convection type superheater in a D-type boiler is protected from radiant heat by                     . generator tubes convection currents control desuperheaters water screen tubes
32 A corbel in the furnace of a water-tube boiler is a                     . preformed burner arch section fillet of plastic refractory formation of soot on furnace floor type of refractory anchor bolt
33 A corbel in the furnace of a water-tube boiler is a fillet of plastic refractory used as a                     . means of excluding slag from the joints at the furnace floor, walls, and corners preformed burner arch section foundation for refractory anchor bolts set of gas baffles in the screen tubes
34 A corbel is used in a boiler furnace to                     . protect the expansion joints reduce gas turbulence direct the flow of gases contain the furnace heat
35 A decrease in condenser vacuum is found to be caused by a loss of the air ejector loop seal.  To reestablish the loop seal, you should                     . crack open the recirculating line from the DC heater to the condenser hot well close in on the recirculating line from the DC heater to the condenser hot well bypass the regulating valve in the condensate recirculating line until the loop refills close the condenser loop seal valve until the loop refills and reopen slowly
36 A desirable property of boiler fuel oil is                     . low carbon content per pound of fuel high sulphur content for complete combustion high BTU content per pound of fuel low residual acid after combustion
37 A dissolved oxygen concentration of 8.0 ppm represents                     . 8 lbs of oxygen dissolved in 1,000,000 tons of water 8 tons of oxygen dissolved in 1,000,000 pounds of water 8 ounces of oxygen dissolved in 1,000,000 ounces of water 80 ounces of oxygen dissolved in 100,000 ounces of water
38 A flame scanner installed in modern boiler combustion control systems, functions to                     . monitor the intensity of the burner flame monitor the stack for soot fires regulate burner fuel oil pressure regulate the air flow to the furnace
39 A flue gas air heater, when installed in a boiler would be accompanied by the operating characteristic(s) of                     .  I. higher uptake temperatures than a boiler without an air heater II. lower corrosion rates in the uptakes and economizer I only II only Both I and II Neither I nor II
40 A flue gas air heater, when installed in a boiler, would be accompanied by the operating characteristic(s) of                     .  I. higher furnace temperatures than a boiler without an air heater II. greater heat absorption per pound of fuel I only II only Both I and II Neither I nor II
41 A flue gas analysis is performed to determine the                     . percentage of nitrogen by volume correct fuel/air ratio for efficient combustion carbon content of the fuel being burned specific heat of combustion products
42 A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is                     . normal and need only be cleaned loose and should be repaired cracked and must be patched spalled and must be replaced
43 A heavy accumulation of soot on the fireside of the superheater can cause a                     . low superheater outlet temperature because of the insulating effect of soot high superheater outlet temperature because of reduced steam flow high superheater inlet temperature because of decreased heat transfer high superheater outlet temperature because of gas laning
44 A high carbon monoxide content in the flue gases of a boiler indicates                     . complete combustion too much excess air incomplete combustion a high carbon content fuel
45 A high percentage of carbon dioxide in boiler flue gases indicates                     . carbonized burner tips too much excess air contaminated fuel oil nearly complete combustion of fuel oil
46 A high water level in a deaerating feed heater will cause the automatic dump valve to drain condensate to the                     . atmospheric drain tank reserve feed tank auxiliary condenser main condenser
47 A higher than normal stack gas temperature could indicate                     . dirty firesides or watersides inner or outer casing leakage eroded water screen tube walls defects in burner cone refractory
48 A hole should be made in the sagged tube occurring in a water-tube boiler, prior to plugging the tube to prevent a                     . pressure buildup in the tube quick burnout of the tube complete sagging failure of the tube crack failure of the tube
49 A leak in a desuperheater could be indicated by an                     . increased boiler water compound level in the boiler with the affected desuperheater increased concentration of dissolved oxygen in boiler water inability to maintain control of boiler water suspended solids inability to maintain proper boiler water pH or phosphate levels
50 A leak in a heating coil in a fuel oil storage tank should  be detected quickly by                     . an increase in fuel oil temperature observing oil on the contaminated evaporator steam coils the presence of fuel oil in the inspection tank the sputtering of burners in the boilers
51 A leak in the heating coils of a fuel oil heater will first show up as                      . water in the fuel oil supply oil in the drain inspection tank sputtering and hissing furnace fires an intense white furnace flame
52 A leak in the internal desuperheater located in one of the two main boilers on a ship can be indicated by a/an                     . decrease in the amount of feed treatment chemicals remaining in that boiler increase in the amount of feed treatment chemicals contained in that boiler decrease in the amount of feed treatment required for proper water chemistry of that boiler increase in the amount of time necessary for priming that boiler
53 A leaking boiler desuperheater may be indicated by a/an                     . I. gradual, but continual rise in phosphate readings in only one boiler II. inability to maintain normal working pressure in the auxiliary steam system I only II only Both I and II Neither I nor II
54 A leaky fuel oil heater relief valve could be indicated by an increase in the                     . sludge tank level discharge piping temperature contaminated drain tank level fuel oil service pump pressure
55 A light brown haze issuing from the boiler smoke stack generally indicates                     . dirty fuel atomizers good fuel combustion too much fuel pressure a high firing rate
56 A lower than normal boiler stack gas temperature usually indicates                     . dirty firesides dirty watersides fuel high sulfur content incomplete combustion
57 A main condenser utilizing a scoop for the circulation of seawater must be constructed as a                     . two-pass heat exchanger single-pass heat exchanger counterflow heat exchanger parallel flow heat exchanger
58 A major difference between the two element and the three element feed water regulator control systems, is that a three element system will additionally measure and incorporate the                      . drum water level to the feed water regulator steam flow to the feed water regulator feed water flow as sensed variable fuel oil flow to the feed water regulator
59 A malfunction in the DC heater is indicated by                     . the boiler requiring excessive amounts of oxygen scavenging chemicals water and steam entering the DC heater at different temperatures condensate coming in contact with steam inside the heater air flowing from vent condenser vent
60 A mechanical carbon dioxide recorder operates by detecting the difference between air and the                     . color of boiler flue gases temperature of the flue gases soot content of the flue gases specific weight of the flue gases
61 A natural circulation water-tube boiler, with one or more water drums, would be classified as a/an                     . accelerated natural circulation boiler controlled circulation boiler header-type boiler drum-type boiler
62 A nozzle reaction safety valve will lift at a pressure lower than required if the                     . adjusting ring is set too low blow down is set too low nozzle ring has come adrift spring compression is insufficient
63 A photoelectric cell is installed in an oil fired boiler safeguard system to introduce proper resistance values to the electronic control circuit.  This device is primarily sensitive to                     . light emitted from the back wall incandescent brickwork light emitted from the front wall incandescent brickwork the orange portion of the flame spectrum the blue portion of the flame spectrum
64 A pneumatic dual element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes                     . two-position differential action proportional action proportional plus reset action on off reset action
65 A practical consideration to allow for when operating a boiler at low load with regard to heat absorption is the requirement to                      . maintain uptake gas temperature above the dew point maintain an excess of CO protect the safety valves from excessive temperature prevent excess air density
66 A primary function of burner atomization steam is to                     . maintain a constantly high fuel pressure prevent overheating of the air register when secured maintain a constantly high fuel temperature impart a swirling motion in the oil spray for efficient combustion
67 A rapid fluctuation of the superheater outlet temperature on a steady steaming boiler could indicate                     . water carryover into the superheater excessive steam flow through the superheater leaks in the superheater element failure of the internal auxiliary desuperheater
68 A regenerative type air heater should be bypassed at low load in order to                     . prevent chipping of the ceramic coating prevent condensation in the steam baffling avoid excessive cooling and condensation of the exhaust gases maintain a positive seal on the replaceable basket
69 A ruptured boiler tube should be removed by                     .  I. splitting the remaining tube sections with a safety ripping chisel II. cutting out most of the tube and then allowing the remaining portion to disintegrate as the boiler is normally fired I only II only Both I and II Neither I nor II
70 A salinity indicator cell is located in the                     . seawater side of the main condenser main condenser hot well evaporator brine suction line low pressure turbine casing drain
71 A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the                     . sample color changes from clear to pink sample color changes from pink to clear water sample pH reaches 10.5 entire concentration of chlorides have been neutralized
72 A secondary function of atomization steam in a fuel oil burner is to                     . maintain a constantly high fuel pressure prevent overheating of the atomizer when not firing during maneuvering maintain a constantly high fuel temperature vary the viscosity of the fuel oil
73 A secondary function of the refractory installed in a marine boiler is to                     . support the boiler casing direct the flow of combustion gases maintain air flow through the burner diffuser support the burner distance piece
74 A set of first and second stage air ejectors are used with a large sea water cooled steam condenser. If the first stage air ejector is not in operation                     .  I.  vacuum can not be established II.  maximum operating vacuum can not be maintained I only II only Both I and II Neither I nor II
75 A single element boiler feed water regulating system used aboard ship utilizes                     . two position differential gap action proportional action proportional plus reset action proportional plus reset plus rate action
76 A slight vacuum is maintained in the shell of the first stage heater shown in the illustration.  The primary reason for the vacuum is to                     . provide a low pressure area to guarantee feed water flow to the heater maintain a positive flow of steam as supplied by the main engine LP bleed system force the use of the main condenser as the drain cooler avoid the necessity of having to use the condensate pumps
77 A small leak in the desuperheater of an operating boiler could cause an                     . immediate increase in superheater outlet pressure immediate decrease in superheater outlet temperature immediate drop in boiler water level inability to maintain required boiler water chemistry
78 A sodium sulfite test is performed on a boiler water sample to determine if                     . there is any excess sulfite present the pH of the boiler water is within the prescribed limits the dissolved oxygen in the boiler water is within tolerable limits the hardness factor is maintained as close to zero as possible
79 A solenoid valve in the boiler fuel oil supply line will close when the                     . main turbine throttle valve is closed boiler is operating at low pressures forced draft fan fails fuel oil temperature exceeds 150F
80 A steam plant is operating at 100% power when the atmospheric drain tank runs dry allowing a large air leakage into the main condenser.  Which of the following will occur as a result of this air leakage? Decreased condensate temperature Decreased pressure in the main condenser Decreased suction pressure at the condensate pump Decreased condenser cooling water outlet temperature
81 A steam supplied heat exchanger will fail to maintain the designed quantity of heated liquid output if the                     .  I. steam side shell absolute pressure is decreased II. heat exchanger drain is leaking I only II only Both I and II Neither I nor II
82 A steam supplied heat exchanger will fail to maintain the designed quantity of heated liquid output if the                     .  I. steam supply absolute pressure is increased II. tubes are leaking I only II only Both I and II Neither I nor II
83 A strong, well defined sound developed by the steam whistle, shown in the illustration, is obtained by adjusting the                     . operating lever stroke whistle valve travel position of the back cover number of diaphragms
84 A sudden increase in boiler water hardness or chloride content could indicate                     . a leaking condenser tube evaporator priming bilge water leaking into the makeup feed tanks all of the above
85 A sudden unexplainable drop has occurred in the outlet temperature of an uncontrolled interdeck superheater on a boiler carrying a higher than normal TDS (total dissolved solids) reading.  Which of the actions listed is required? Immediate increase in the firing rate. Reduction in the forced draft fan speed. Lowering the steam drum water level. Raising the feed water temperature.
86 A sulfite test is conducted on boiler water to check for                     . nitrates sulfates phosphates excess oxygen scavenging agents
87 A suspected leak in an operating fuel oil heating coil is normally confirmed by                     . checking the pH of heating coil returns conducting a soap test conducting a blotter spot test checking the drain inspection tank
88 A test of boiler water for chloride content indicates the amount of                     . suspended matter present dissolved gases present seawater contamination present all of the above
89 A theoretical engine cycle is a process that                   . takes place in the combustor of the engine begins with certain conditions, progresses through a series of additional conditions and returns to the original conditions begins with certain conditions, progresses to a steady state and stays there None of the above.
90 A triple element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes                     . two-position differential gap action proportional action proportional plus reset action proportional plus reset plus rate action
91 A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by                     . hand activating the over speed trip closing off the steam via the excess pressure pump governor slowly closing the manual throttle opening wide the recirculating valve and then manually closing the throttle
92 A two-element boiler feed water regulator is controlled by                     . steam flow and feed water flow steam flow and drum water level drum water level and feed water flow drum water level and drum pressure
93 A two-element feed water regulator not only responds to changes in water level, but is also designed to react to                     . feed water flow steam flow fuel flow steam pressure
94 A two-element feed water regulator reacts to changes in the steam drum water level and the                     . steam flow from the boiler main feed pump speed water flow to the boiler signal from the flame scanner
95 A two-element feed water regulator responds directly to changes in                     . feed water flow to the boiler feed water pump discharge pressure DC heater water level steam flow from the boiler
96 A unit of measure used to express the chloride content of boiler water is                      . PPM Micro-Farads pH Micro-Ohms
97 A vent line is provided on each water box of the main condenser in order to prevent                     . insufficient head pressure being developed on the circulating pump discharge inadequate heat transfer from developing during normal operation Both A and B Neither A nor B
98 A vent line is provided on each water box of the main condenser in order to prevent                     .  I. insufficient head pressure being developed on the circulating pump discharge II. inadequate heat transfer from developing due to air bound tubes I only II only Both I and II Neither I nor II
99 A water-tube boiler can be laid up either wet or dry.  If it is to be laid up wet, you should                     . completely fill the boiler with water, then blow down to steaming level completely fill the boiler with deaerated feed water and maintain a slight pressure drain and refill the boiler each week drain and refill the boiler when the pH goes above 6
100 A water-tube type boiler is more efficient than a fire-tube type boiler as                     . a water-tube boiler requires less maintenance the water-tube boiler produces more pounds of steam per pound of boiler Both "A" and "B" Neither "A" or "B"
101 A water-tube type boiler when compared to a fire-tube type boiler has an advantage of                     .  I. a water-tube boiler requiring less chemical compounding  II. the fire-tube boiler providing a greater amount  of heat transfer to the water as the hot gases  pass through the tubes I only II only Both I and II Neither I nor II
102 According to 46 CFR Part 61, which of the following statements is true concerning the inspection of water-tube boilers? All mountings shall be opened up and examined by a Coast Guard inspector at eight year intervals after the initial inspection. All boiler mounting studs or bolts shall be removed for examination by a Coast Guard inspector every 4 years after  initial inspection. Boiler mountings attached to boiler nozzles must be opened and removed for examination every 8 years. Boiler mountings attached directly to the boiler plating by screwed studs and nuts shall be removed and examined every 10 years.
103 According to 46 CFR Parts 59 and 35, which of the following is true? The OCMI must be notified of emergency repairs to boilers and unfired pressure vessels. The fuel burned in boilers of tank ships shall have a flash  point of not less than 120F. A one gallon sample of each load of fuel oil shall be drawn and sealed at the time of supply and preserved until that fuel is exhausted. All of the above.
104 According to 46 CFR, which of the following statements is true concerning main boiler safety valve escape piping? Expansion joints or flexible pipe connections are prohibited. The piping shall be led as near vertical as possible to the atmospheric drain tank. The piping should be supported and installed so that no stress is transmitted to the valve body. All of the above.
105 According to 46 CFR's, all oil-fired main propulsion boilers with automatic burner safety control systems must be provided with               . controlled desuperheaters stack temperature pyrostats one flame detector for each burner one flame detector in each furnace
106 According to 46 CFR's, steam piping subject to main boiler pressure must be hydrostatically tested at specified intervals.  Therefore, which of the following statements is true? The piping must be tested at a pressure and temperature specified by a Coast Guard marine inspector. The piping must be tested at 1 1/2 times working pressure every 4 years. Piping under 3 inches nominal pipe size need not be hydrostatically tested. The piping must be tested at 2 times maximum allowable pressure every 4 years.
107 According to Coast Guard Regulations (46 CFR) a 'oil fuel unit' is correctly described by which of the following statements? The amount of heat released by burning a 'unit' amount of fuel oil. Equipment used for the preparation of fuel oil for delivery to an oil fired boiler. The amount of thermal units required to raise the temperature to the flash point in an open cup tester. The amount of thermal units necessary to cause a liquefied  flammable gas to exceed a certain Reid vapor pressure.
108 According to Coast Guard Regulations (46 CFR), a 1200 psig  maximum allowable working pressure boiler, with external blow off piping is required to have the blow off piping withstand a minimum of                     . 1200 psig 1425 psig 1500 psig 1575 psig
109 According to Coast Guard Regulations (46 CFR), blow off piping external to a boiler with a maximum allowable working pressure of 600 psig must be capable of withstanding a minimum pressure of                     . 600 psig 750 psig 825 psig 900 psig
110 According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of                      . 250 psig (1825 kPa) or over 300 psig (2169 kPa) or over 400 psig (2859 kPa) or over 600 psig (4238 kPa) or over
111 According to Coast Guard Regulations (46 CFR), fusible plugs are not permitted on auxiliary boilers where the maximum steam temperature to which they are exposed exceeds                     . 206F 218F 425F 850F
112 According to Coast Guard Regulations (46 CFR), periodic hydrostatic tests are required to be conducted without exception on all                     . main propulsion boilers auxiliary steam piping air receivers all of the above
113 According to Coast Guard Regulations (46 CFR), the studs and bolts on marine boiler mountings must be removed for examination at least every                     . 3 years 4 years 5 years 10 years
114 According to Coast Guard Regulations (46 CFR), what action  should be taken if the metal thickness of a marine boiler is found to be thinner than original specifications? Affected areas should be built up by welding. Boiler should be condemned. Drum should be renewed before the next biennial inspection. Working pressure should be recalculated.
115 According to Coast Guard Regulations (46 CFR), what is the maximum time interval for hydrostatically testing boilers on a cargo vessel having water-tube boilers? 1 year 2 years 5 years 8 years
116 According to Coast Guard Regulations (46 CFR), what is the minimum flash point of oil to be used as fuel for the boilers? 80F (26.7C) 110F (43.3C) 140F (60.0C) 150F (65.6C)
117 According to Coast Guard Regulations (46 CFR), what is the highest steam temperature to which fusible plugs may be exposed? 290F 375F 425F 500F
118 According to Coast Guard Regulations (46 CFR), which of the following is classified as a boiler mounting? Main feed check valve Soot blower element Blow off valve Escape piping drain valve
119 According to Coast Guard Regulations (46 CFR), which of the following is permitted in boiler fuel oil service system discharge piping? Screwed bonnet valves of the union bonnet type. Pipe unions one inch or greater in diameter. Bushings made of seamless steel. Street ells made of carbon steel.
120 According to Coast Guard Regulations (46 CFR), which of the following steam piping conditions, subjected to main boiler pressure, is exempted from hydrostatic testing? All piping with a nominal size of 3 inches or less. All piping from the main steam stop to the throttle valve. All piping to the ship's service generators. All piping equipped with a safety or relief valve.
121 According to Coast Guard Regulations, boiler safety valves                     . shall not have valves on drain lines will only be set and sealed by the Chief Engineer will be provided with a suitable lifting device operated only from the fire room all of the above
122 According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 126.08 degrees Fahrenheit? Subcooled liquid. Saturated liquid. Mixture of saturated liquid and vapor. Superheated vapor.
123 According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 138.79 degrees Fahrenheit? Subcooled liquid. Saturated liquid. Mixture of saturated liquid and vapor. Superheated vapor.
124 According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees Fahrenheit? Subcooled liquid. Saturated liquid. Mixture of saturated liquid and vapor. Superheated vapor.
125 According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 29.00 inches Hg, and 85.21 degrees Fahrenheit? Subcooled liquid. Saturated liquid. Mixture of saturated liquid and vapor. Superheated vapor.
126 According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating block"? 1 2 3 7
127 According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating brick"? 1 2 3 7
128 According to the illustration of a typical boiler furnace rear wall, which item number would best represent "standard fire brick"? 1 2 3 7
129 According to the illustration, what part number identifies the "air door handle"? 4 6 7 12
130 According to the illustration, what part number identifies the "air doors"? 1 3 9 4
131 According to the illustration, what part number identifies the "diffuser"? 1 3 9 7
132 According to the illustration, what part number identifies the "igniter"? 2 3 7 9
133 According to U. S. Coast Regulations (46 CFR), water-tube boilers shall be hydrostatically tested on passenger vessels every                      . year 2 .5 years 5 years 8 years
134 According to U.S. Coast Guard Regulations (46 CFR), which of the following pumps is required to have a pressure gage provided on the discharge side of the pump? Fire pump Boiler Feed pump Fuel oil transfer pump All of the above
135 Accumulation of fuel oil in the boiler double casing could  be caused by                     . leaking fuel oil strainers dripping atomizers high atomizing steam pressure faulty steam atomizer return traps
136 Accumulation tests are conducted in order to determine the                     . steam generating capacity of an individual boiler steam relieving capacity of safety valves maximum combined oil consumption of all oil burners installed on a single boiler maximum combined steam generating capacity for all propulsion boilers of a single plant
137 Advances in metallurgy and improved methods of boiler tube fabrication has led to lighter tubes with wall thicknesses  in the vicinity of 0.1 inches.  A characteristic of these thin walled tubes is                     . low tube metal temperatures decreased probability of tube failure during normal operating conditions better heat transfer characteristics all of the above
138 After a boiler generating tube has been plugged,                     . a hole should be made in the defective tube the firing rate should be reduced the steam flow rate must be increased all of the above
139 After a boiler has been taken off the line and is cooling,  the air cock is opened to                     . purge all air from the steam drum allow even cooling of the steam drum guard against entrapped gas pockets in the superheater prevent the formation of a vacuum within the boiler
140 After being required to plug an excessive number of leaking condenser tubes on the main condenser, what changes would you expect to observe when returning to normal steam plant sea speed operation? Absolute pressure and hot well temperature will increase. Absolute pressure will decrease and hot well temperature will increase. Absolute pressure will increase and hot well temperature will decrease. Absolute pressure and hot well temperature will decrease.
141 After patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to                     . prevent spalling vent escaping moisture allow for expansion prevent slag buildup
142 After restoring the normal water level in a boiler  following a high water casualty, you should                     . immediately put the boiler on the line immediately drain the economizer blow down the water gage glass completely drain the superheater
143 After routine blowing of tubes at sea, there should be a decrease in the                     . fuel oil temperature stack temperature excess air required for complete combustion CO2 in the stack gas
144 After steam has been raised and a boiler is being placed on the line, the superheater vent can be closed when                     . main and auxiliary steam line drains are opened the boiler steam stops have been warmed up boiler pressure is 5 psi above line pressure the boiler is supplying auxiliary steam
145 After the main engine has reached full sea speed, which of the following conditions could cause the water level in the boiler steam drum to keep falling? Open cutout valves on the boiler gage glasses. Condensate recirculating line is excessively open. Feed pump discharge pressure is set too low. Feed pump recirculating valve is closed.
146 After the steam leaves the low pressure turbine, it enters the                      . main condenser feed and filter tank first-stage feed water heater turbine extraction valve manifold
147 Air accumulated in the aftercondenser of the air ejector unit is discharged directly to the                     . intercondenser high pressure turbine main condenser atmosphere
148 Air accumulated in the intercondenser of the air ejector assembly is discharged directly to the                     . aftercondenser high pressure turbine main condenser atmosphere
149 Air for combustion is bypassed around the boiler air heater when the                     . soot blowers are operating control desuperheater is operating combustion control system is in manual boiler is steaming at low rates
150 Air in the main condenser is harmful because it will                     . decrease the turbine exhaust steam pressure decrease the vacuum in the main condenser cause heat to be transferred too rapidly cause the turbine casing to warp and bow
151 Air leaks through the inner or outer casing of a boiler could result in                     . high superheater outlet temperature low superheater outlet temperature higher fuel consumption for normal steaming conditions all of the above
152 Air leaks through the inner or outer casings of a boiler will                     . improve fuel combustion decrease stack temperatures cause boiler panting reduce boiler efficiency
153 Air removed from the main condenser is vented to the atmosphere through the                     . vacuum breaker vent condenser atmospheric drain tank aftercondenser
154 Air trapped within the main condenser shell is detrimental because it will                     . decrease the turbine exhaust steam temperature cause the turbine casing to warp and bow decrease the vacuum in the main condenser cause heat to be transferred too rapidly
155 All fuel oil service pumps are equipped with a                     . relief valve on the suction side combustion control valve on the discharge side remote means of stopping the pump direct suction to the double bottom tanks
156 All oil-fired main boilers with automatic safety control systems must be provided with               . a modulating pressuretrol, sensing both steam and temperature a pyrostat measuring decreased steam temperature one flame detector for each burner one flame detector in each furnace
157 All oil-fired main propulsion boilers with automatic safety control systems must automatically close the burner valve when                  . flame in boiler furnace is confirmed actuated by boiler safety trip burner is properly seated starting trial for ignition occurs
158 All oil-fired main propulsion burners with automatic safety control systems must automatically close the burner valve when                    . the flame in boiler furnace is confirmed starting "trial for ignition" the burner is properly seated actuated by a boiler safety trip
159 All ships with periodically unattended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an                     . accommodation space communication system engineer's assistance- needed alarm remote vital system alarm all of the above
160 All ships with periodically unattended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an                     . engineer's assistance- needed alarm accommodation space communication system personnel alarm all of the above
161 Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by                     . testing frequently for total dissolved solids maintaining low boiler water pH giving the boiler frequent surface blows maintaining a normal level of scavenging agents
162 An accumulation of slag build up on the boiler furnace floor will cause                     . I. peeling of furnace brickwork II. overheating of the furnace floor I only II only Both I and II Neither I nor II
163 An accumulation test is performed on the boiler to determine the suitability of the safety valves and the set points                     .  I. if the boiler normal operating pressure is permanently reduced II. when the steam generating capacity is increased I only II only Both I and II Neither I nor II
164 An adequate phosphate reserve should be maintained in boiler water to                     . prevent hard scale formation reduce the blow down frequency maintain a pH of 7 remove dissolved oxygen concentrations
165 An advantage of steam atomization compared to mechanical atomization is                     . its greater turndown ratio improved heat transfer in the boiler the ability of the system to maintain the proper ratio of fuel and air at all rates of combustion bleed steam is utilized thereby increasing plant efficiency
166 An advantage of using boiler furnace studded water wall tubes packed with refractory is                   . thinner tubes can be used fewer tubes are required lower quality steel can be used lower furnace wall operating temperature
167 An advantage of using boiler furnace studded water wall tubes packed with refractory is that                     . thinner tubes can be used thicker tubes are required lower quality steel can be used the use of dense firebricks is not required
168 An excessively high superheater temperature could be the result of                     . excessive air high feed water temperature soot accumulation on the superheater excessive steam demand
169 An explosion or flareback could occur in a boiler if                     . too much excess air were supplied for combustion the boiler firing rate exceeded the end point of circulation the fuel being burned had been heated to the flash point the firebox is not purged before attempting to light a fire
170 An incandescent white flame in a boiler firebox would indicate                     . efficient combustion low fuel oil temperature excessive fuel oil pressure too much excess air
171 An increase in the concentration of total dissolved solids  in boiler water can result from                     . zero water hardness dissolved oxygen deaeration routine treatment with phosphates frequent prolonged surface blows
172 An increase in the pressure drop between the inlet and outlet of the feed water heater waterside, not due to a waterside obstruction, would indicate                     . insufficient water velocity through the heater a water flow rate higher than feed water heater design limits fouling of the heater steam side an accumulation of non- condensable gases in the steam circuit
173 An indication of a faulty superheater soot blower element is a                      . low stack temperature low superheater outlet temperature high superheater outlet temperature low fuel oil consumption
174 An indication of a moderate leak existing in a desuperheater is                      . high auxiliary steam pressure low auxiliary steam temperature reduced feed water consumption a sudden increase in make-up feed
175 An indication of excessive soot accumulation on boiler water tubes and economizer surfaces is                     . low stack temperature high stack temperature lower feed water flow high feed water temperature
176 An internal leak in a fuel oil heater can result in                     . water contamination of the fuel oil oil contamination of the heater drains carbon buildup in the heater fluctuating fuel oil pressure
177 An obstruction in the top connection of a boiler gage glass will cause the                     . water level to remain constant in the glass water level to rise slowly in the glass gage glass to overheat and break gage glass to be blown empty
178 Any feed water testing done on a routine basis would normally include testing for                     . chloride phosphate electrical conductivity (total dissolved solids) all of the above
179 Arrow "B" shown in the illustration indicates the                     . regenerative air heater retractable soot blower opening combustion air inlet uptakes
180 As a general rule, for proper results castable fireclay must be air cured for                     . 12 hours 18 hours 24 hours 48 hours or longer
181 As compared with a typical front fired boiler, which of the listed conditions represents an advantage of a top fired boiler? No division tube wall separating the convection and radiant sections of the furnace is ever required. Superheating diaphragms may be omitted. More uniform heat distribution and gas dwell is obtained within the furnace. A lower fuel flow rate can be allowed, thus increasing economy.
182 As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to                     . provide a backup means for manual control of the system control the boiler drum water level within acceptable limits regardless of the load introduce a control for maintaining constant superheated steam temperature regardless of boiler load introduce a control for maintaining constant steam pressure regardless of boiler load
183 As steam accomplishes work in an engine or turbine, it expands and                     . increases in superheat decreases in superheat decreases in volume decreases in moisture content
184 As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it                     . diminishes in volume becomes saturated again expands in volume becomes superheated again
185 As the percentage of CO2 in the stack gas decreases, you can assume that                     . the fuel to air ratio is increasing fuel is being burned with increasing economy you are approaching secondary combustion excess air is increasing
186 As the pH of the boiler water approaches zero, the water becomes increasingly                     . soft alkaline neutral acidic
187 As the rate of combustion is increased in a boiler, more steam is generated because the                     . fires are hotter mass flow rate of hot gas increases furnace becomes hotter flue gas turbulence decreases
188 Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant.  When there is an increase in the temperature of the steam and water in the boiler, which of the following effects will occur on the pressure and the specific volume  of the steam? The steam pressure and volume will remain constant. The pressure will increase and the volume will remain constant. The pressure will remain constant and the volume will increase. The pressure will increase and the specific volume will decrease.
189 Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate                     . no CO, low O2, and high CO2 low CO2, no O2, and high CO high CO, high CO2, and no O2 high O2, low CO, and low CO2
190 At a given pressure, erosion of steam piping and machinery will be minimized by utilizing                     . superheated steam desuperheated vapor wet steam saturated steam
191 At which point of the blistered boiler tube shown in illustration will the temperature be the greatest? A B C D
192 Automatic fuel shutoff to the burners of a main propulsion boiler could result from                     . high boiler water level carbon deposits on the ignition electrode dirty flame scanner excessive fuel return pressure
193 Auxiliary exhaust steam can generally be used as a supply for the                      . air ejectors steam atomizers air heater supply fuel oil heaters
194 Auxiliary steam at full operating pressure is supplied from the boiler directly to the                     . turbo generators main air ejectors distilling plants soot blowers
195 Before an explosion can occur in a boiler furnace, there must be an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a                     . space large enough for the explosion to occur ground in the burner ignition electrode high steam demand on the boiler source of ignition for the explosive mixture
196 Before blowing tubes in a boiler equipped with steam soot blowers, you should                     . increase the boiler water level decrease the boiler water level reduce the forced draft fan speed lower the boiler steam pressure
197 Before commencing a surface blow, the boiler                     . should be cold water level should be lowered to the surface blow line water drum should be checked for sludge water level should be raised 2 to 3 inches (5 to 7.6 cm) above normal
198 Before giving a boiler a bottom blow, it should be taken off the line and then the                     . water level initially lowered below normal boiler steam pressure should be increased water level initially raise above normal boiler air cock should be cracked
199 Before giving a boiler a surface blow when underway at sea, you should                     . raise the water level 2 or 3 inches above normal lower the water level 2 to 3 inches below normal increase forced draft air pressure to maximum temporarily secure all burners on that boiler
200 Before giving a boiler a surface blow, you must                     . open the skin valve on the blow down line secure the fires in the furnace lower the water level to a half glass increase the boiler steam pressure above normal
201 Before giving a boiler a surface blow, you should                     . raise the water level 2 or 3 inches above normal lower the water level to the normal level reduce the boiler firing rate to the minimum take the boiler off the line and let it cool 1 hour
202 Before lighting any burner in a cold boiler you should always                     . purge the furnace with air open the furnace peephole cover close off the burner register reduce the forced draft pressure
203 Before using a boiler compressed air soot blower system, you should                     . reduce the boiler pressure lower the water level decrease the forced draft fan speed drain the soot blower pneumatic operating lines
204 Before using the steam soot blowers to blow tubes at sea, you should                     . raise the water level lower the water level increase the firing rate decrease the firing rate
205 Bi-color water level indicators, connected directly to the boiler drum, operate on the principle of                     . different refractive properties of steam and water special insoluble indicating fluids different chemical properties of steam and water different densities which result from the comparison of the varying steam pressure in the drum
206 Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by                     . excessively high fuel pressure low fuel temperature high fuel temperature low fuel pressure
207 Blisters developing on boiler tubes can be caused by                     . air in the feed water cold feed water hot feed water waterside scale deposits
208 Blowing down a water wall header while steaming a boiler at a high firing rate could result in                     . excessive strain on boiler blow down lines the thermo-hydraulic feed water regulator valve slamming closed a load imbalance between other boilers on the line an interruption in the water circulation
209 Boiler efficiency and its ability to absorb heat is limited by the need to                     . maintain an excess of CO during transient firing rates prevent excess air density at low load conditions protect the safety valves from excessive temperature maintain uptake gas temperature above the dew point
210 Boiler firesides must be kept free of soot accumulations because                     . soot interferes with the flow of feed water the steam drum internals will become clogged the fuel oil heaters will become overloaded soot insulates the boiler heating surfaces
211 Boiler forced draft pressure should be increased before blowing tubes to                     . prevent condensation in the uptakes aid in removing loosened soot maintain a clear stack prevent a drop in steam pressure
212 Boiler fuel oil atomizer parts should be cleaned by soaking in 'tip cleaner' or diesel fuel and                     . polished with emery cloth brushed with a steel brush scraped with a nonabrasive tool scraped with a modified table knife
213 Boiler fuel savings gained by the use of an economizer can amount to                     . three percent for each 5F rise in feed water temperature one percent for each 10F rise in feed water temperature one half percent for each 15F rise in feed water temperature three percent for each 20F rise in feed water temperature
214 Boiler furnace brickwork can be fractured and broken by thermal shock caused by                     . leaving the registers open on a hot boiler load changes on the boiler while answering bells allowing the furnace to cool too slowly cold feed water passing through the boiler economizer
215 Boiler refractories previously baked out and fired are most sensitive to                     . rapid cooling sustained high furnace temperature rapid heating radiant heat of the burner
216 Boiler refractory anchor bolts are secured to the casing by                     . hooked ends inserted into pads welded to the casing slots in the firebrick high strength tensile fasteners furnace mortar
217 Boiler refractory firebrick is secured to the casing by                     . slots in the brick engaging anchor bolts high strength tensile fasteners studding on the water wall tubes fast drying plastic refractory mortar
218 Boiler screen tubes are used to protect which of the listed components from high furnace temperature? Superheater Refractory Wall tubes Steam drum
219 Boiler stack gas temperature could be higher than normal if                     . leakage exists in the inner and outer casing defects exist in the burner cone refractory fuel oil temperature is excessively high secondary combustion occurs in the gas passages
220 Boiler stack gas temperatures will be higher than normal when                      . fuel temperature at the burners is excessively high not enough excess air is being supplied for combustion secondary combustion is occurring in the gas passages internal water wall refractory baffles have failed
221 Boiler superheaters are designed to                     . raise the sensible heat of the steam increase the overall mechanical efficiency of the plant provide continuous steam flow to the control desuperheater raise the latent heat of the steam
222 Boiler tube failures can result from                     . corrosion overheating mechanical stress all of the above
223 Boiler water hardness is increased by                     . zero alkalinity in the water scale forming salts in the feed water dissolved gases in the water improper operation of the DC heater
224 Boiler water samples should be circulated through a cooling coil prior to analysis because                     . this prevents the boiler water from flashing into steam as the sample is collected it reduces the amount of suspended matter that frequently finds its way into the dead end lines the cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify the degree of acidity as measured on the pH recorder is amplified by cool water temperatures
225 Boilers equipped with steam atomized burners can be operated without changing burner tips because steam atomization                     . maintains the oil at ignition temperature finely atomizes fuel oil over a band of fuel oil system pressures automatically cleans the burner tips and eliminates fouling regulates itself by responding to the position of the main engine throttles
226 Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because                     . steam maintains the oil at the fire point temperature atomizing steam pressure is held constant for all load ranges it is not necessary to regulate fuel oil pressure at the burners with this system steam velocity aids in the atomizing of fuel oil over a wide range of fuel pressures
227 Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because                     . steam maintains the oil at the fire point temperature atomizing steam pressure is held constant for all load ranges it is not necessary to regulate fuel oil pressure at the burners with this system the degree of atomization is not dependent upon fuel oil pressure
228 Brick bolts, tile bolts, and pennant anchors are attached to the inner casing by                     . retaining clips fillet welds tack welds All of the above are correct.
229 Bunker "C" fuel oil is heated prior to atomization to                     . increase the heating value increase its specific gravity reduce its viscosity reduce the flash point
230 Burning fuel with entrained saltwater, will cause a glassy slag formation on furnace refractory.  This slag will                     . form a protective coating thus increasing its life seal refractory joints thereby improving its function expand at a different rate and result in damaged refractory increase the furnace efficiency because of reduced firebox turbulence
231 Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals? Sodium phosphate Sodium hydroxide Phenolphthalein Caustic soda
232 Carbon deposits in a fuel oil heater are caused by                     . low fuel oil temperature high fuel oil temperature low fuel oil viscosity high fuel oil pressure
233 Carbon deposits on the boiler burner throat ring is usually caused by                     . too much excess combustion air a faulty ignition electrode a dirty atomizer sprayer plate the burner cycling on and off
234 Carbon deposits on the diffuser and register throat ring of a burner                     . interfere with air flow around the burner cause pre-ignition of the atomized fuel allow heat loss to the boiler casing are of no consequence and may be left in place until a fireside inspection allows time for removal
235 Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas                     . forms carbonic acid which attacks the watersides breaks the magnetic iron oxide film inside boiler tubes combines with sulfates to cause severe waterside pitting combines with oxygen to cause severe waterside scaling
236 Carbonization of the conductive surfaces of a fuel oil heater results in reduced heating capacity because                     . a fluid film layer covers the solid contaminants and increases heat transfer the relative velocities of the fluids must be decreased causing a corresponding loss of heat transfer the thermal conductivity of solidified contaminants is poor radiational heat transfer becomes severely impaired
237 Carryover in a marine boiler can be caused by                     . boiler water contaminants low boiler water alkalinity a high concentration of hydrazine in the boiler water operating under low load conditions for extended periods
238 Chemicals are added to boiler feed water to                     . reduce the frequency of blow downs prevent precipitation of sludge decrease heat transfer precipitate dissolved oxygen
239 Chemicals are added to boiler water by injecting them                     . as a powder into the mud drum as a powder into the steam drum in solution into the main feed line in solution through the chemical feed pipe
240 Chemicals are added to boiler water in order to                     . reduce oxygen corrosion reduce the total dissolved solids content decrease the necessity for blow downs eliminate dissolved chlorides
241 Chemicals are added to boiler water to                     . eliminate the need for blow downs stabilize feed water if a boiler becomes salted up prevent scale forming deposits maintain an acidic condition in the feed water
242 Circulation in a water-tube boiler is caused by the difference in the                      . area and length of the water-tubes densities of the circulating water heights of the boiler drum angle of inclination of the tubes
243 Circulation of boiler water to the water wall tubes is maintained by the                     . water screen tubes risers downcomers generating tubes
244 Circulation of water and the steam/water mixture within a natural circulation boiler is retarded by                     . large changes in steam density fluid friction in the downcomers, drums, generating tubes,  and headers high feed water pressure back pressure in the steam drum acting on the user tubes
245 Clean low pressure steam drains are collected in the                     . deaerating feed water heater contaminated drain inspection tank atmospheric drain tank main condenser hot well
246 Coast Guard Regulations (46 CFR Part 52) concerning boiler superheater safety valves require that the valve                 . be set at a lifting pressure that is higher than the drum safety valve have a drain opening tapped for not less than 1/4 in. NPS be constructed with a cast iron body have a threaded inlet connection if greater than 2 in. NPS
247 Coast Guard Regulations (46 CFR Part 56) permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of                     . 350 psi and 460F 350 psi and 406F 250 psi and 460F 250 psi and 406F
248 Coast Guard Regulations (46 CFR Part 56) require that new fuel oil service piping between pumps and burners be subjected to                     . a hydrostatic test of 1.5 times the maximum allowable pressure but not less than 500 psi (3447 kPa) a hydrostatic test of 1.25 times the maximum allowable pressure with the relief valves closed spot radiographic examination of portions of the finished weld joints a hydrostatic leak test to the design pressure specified by the Coast Guard
249 Coast Guard Regulations (46 CFR) concerning marine boilers, require the installation of a safety valve on the                     . auxiliary steam outlet desuperheated steam outlet preheated steam outlet superheated steam outlet
250 Coast Guard Regulations (46 CFR) concerning superheater safety valves require that the valve                     . be set at a pressure higher than the drum safety valves can only be operated by a pilot valve nominal size is not less than 1.5 inches nor more than 4 inches is not set at a pressure less than the feed pump relief valve
251 Coast Guard Regulations (46 CFR) for boiler fuel oil service systems require                     . fuel oil heaters for boilers burning fuels with low viscosity fuel oil service tanks to overhang boilers to utilize heat  radiated from the boilers for greater efficiency machinery driving fuel oil service pumps to be fitted with  remote controls so that they may be stopped in the event of a fire all piping between service pumps and burner fronts to be located below the floor plates to eliminate fire hazards
252 Coast Guard Regulations (46 CFR) for boiler fuel oil service systems, require that                     . discharge piping from the service pumps to the burners must be of schedule 60 seamless steel the return line from the burners must be arranged so that suction piping cannot be subject to discharge pressure the fuel oil service pump relief valve must discharge to a  wing tank the suction strainer must be a simplex type
253 Coast Guard Regulations (46 CFR) for boiler safety valves, require that                     . no valves of any type shall be installed in the leak off from drains or drain headers all safety valve gags or clamps must be carried on board the vessel at all times the final setting of the safety valves shall be checked and adjusted under steam pressure All of the above are correct.
254 Coast Guard Regulations (46 CFR) permit repairs and adjustments to boiler safety valves while installed on a main propulsion boiler and may be made by                 . the chief engineer in an emergency any competent person on the ship an approved repair facility only only the safety valve manufacturer
255 Coast Guard Regulations (46 CFR) prohibit which of the following pipe fittings from being installed in fuel oil service discharge piping? Pipe unions Screwed bonnet valves Street ells Bolted flange joints
256 Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that                     . the hydrostatic test shall be applied from the boiler drum  to the throttle valve not less than fifty percent of the lagging shall be removed each time the hydrostatic test is applied the hydrostatic test pressure must be maintained on the piping for a minimum of one hour a pipe with a nominal size of six inches or more is not required to be hydrostatically tested
257 Coast Guard Regulations (46 CFR) require that alarm systems be provided for superheaters whose operating outlet temperature is capable of exceeding                     . 550F (288C) 650F (343C) 750F (399C) 850F (454C)
258 Coast Guard Regulations (46 CFR) require that boiler mountings shall be removed and studs examined by a Coast Guard inspector                     . every 4 years every 10 years when the boiler is hydrostatically tested at each inspection for certification
259 Coast Guard Regulations (46 CFR) require that in preparing a water-tube boiler for a hydrostatic test, you should fill the boiler with water at a temperature of not less than                     . 50F and not more than 100F 70F and not more than 160F 60F and not more than 120F 100F and not more than 200F
260 Coast Guard Regulations (46 CFR) require that main steam piping must be hydrostatically tested at specified  intervals. If the pipe insulation cannot be removed during this test, the piping shall be tested at                     . 1 1/4 times the maximum allowable working pressure and the  pressure maintained for 10 minutes 1 1/2 times the maximum allowable working pressure and the  pressure maintained for 20 minutes operating pressure and temperature and the pressure maintained for 1 hour a pressure and temperature specified by a Coast Guard marine inspector
261 Coast Guard Regulations (46 CFR) require that quick- closing valves on a fuel oil service system should be installed as  close as is practicable to the                     . suction side of the fuel oil pump boiler front fuel oil header fuel oil settling tanks fuel oil service heaters
262 Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to                     . the feed pump shut off head pressure 110% of the drum safety valves highest set pressure 125% of the boiler hydrostatic test pressure 150% of the boiler design test pressure
263 Coast Guard Regulations (46 CFR) require that the final setting of boiler safety valves be conducted in presence of the                      . Chief Engineer COTP OCMI Marine Inspector
264 Coast Guard Regulations (46 CFR) require the duplex fuel oil discharge strainers installed in boiler fuel oil service systems to be                     . located so as to preclude the possibility of spraying oil on the burner or boiler casing as close to the fuel oil service manifold as practicable enclosed in a drip-proof vented enclosure to reduce the possibility of fire a positive venting system that will return any vapors to the pump suction
265 Coast Guard Regulations (46 CFR) require the temperature of the water leaving an oil fired, cast iron, low pressure, hot water heating boiler must not exceed                     . 190F (87.8C) 210F (98.9C) 230F (110.0C) 250F (121.1C)
266 Coast Guard Regulations (46 CFR) require unfired pressure vessels with manholes to be hydrostatically tested                     . every four years every eight years at each certification inspection at the discretion of the marine inspector
267 Coast Guard Regulations (46 CFR) require unfired pressure vessels with manholes to be hydrostatically tested                     . every 4 years every 8 years at each certification inspection at the discretion of the marine inspector
268 Coast Guard Regulations (46 CFR) requires machinery driving the fuel oil transfer and fuel oil service pumps to be fitted with a remote means of stopping that machinery                     . within the space concerned outside of the space concerned at the throttle station within the fire room
269 Coast Guard Regulations (46 CFR) state that a marine inspector may require a boiler to be drilled or gaged to determine actual thickness                     . at the first inspection for certification to preclude nondestructive testing methods at any time its safety is in doubt when boiler drum thickness has decreased by 5%
270 Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is                     . 300 psig (2169 kPa) or over 350 psig (2413 kPa) or over 500 psig (3548 kPa) or over 550 psig (3893 kPa) or over
271 Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is                     . more than 200 psig (1436 kPa) more than 250 psig (1795 kPa) more than 300 psig (2169 kPa) more than 350 psig (2513 kPa)
272 Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are required to be fitted with a surface blow off valve if the design pressure is                     . less than 200 psig (1436 kPa) less than 250 psig (1795 kPa) less than 300 psig (2169 kPa) less than 350 psig (2513 kPa)
273 Coast Guard Regulations (46 CFR) state that the temperature of the water for a hydrostatic test on a fire-tube boiler will be not less than 70 and not more than                     . 90F 100F 130F 160F
274 Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked                     . at least once a year at least once every 4 years when the generating capacity of the boiler is increased when repairs have been made to the safety valves
275 Coast Guard regulations require that the superheater safety valves                      .  I. and the drum safety shall have a total rated capacity not less than the maximum generating capacity of the boiler II. be set and adjusted under pressure, regardless of the pilot pressure source I only II only Both I and II Neither I nor II
276 Coast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure? 0% 25% 75% 90%
277 Combustion control systems on automatic boilers are designed to prevent immediate burner ignition after a normal or safety shutdown in order to allow time for                     . the furnace to be purged electric charge buildup in the igniter the fuel pump to start the drum level to equalize
278 Combustion gases can leak into the fire room through                     . desuperheater seals fouled burner registers idle burner assemblies soot blower swivel tube packing glands
279 Compared to the return flow oil burner system, an internally mixed steam atomizer requires                     . higher fuel oil viscosity less excess air higher air velocity greater turbulence in the air/oil stream
280 Component "B" shown in the illustration is properly identified as the                      . drumhead wrapper sheet tube sheet drum crown
281 Condensate accumulating in the steam side of a fuel oil heater could result in                     . overheating scale accumulation corrosion immediate oil contamination of the condensate
282 Condensate accumulation in the steam side of a fuel oil heater could result in                     . scale accumulation in an operating heater water contamination of the fuel oil reduced heating capacity in an operating heater annealing of the heater tube bundles
283 Condensate from fuel oil heating coils return to the                     . feed water heater engine room bilge reserve feed tank drain inspection tank
284 Condensate is pumped from the condenser to the DC heater instead of directly to the boiler because                     . boiler feed pumps must operate with a negative suction head suspended solids in the condensate must be eliminated condensate should be deaerated before entering the boiler condensate at condensing temperature is too hot and will cause thermal stress in the boiler
285 Condensate pumps have distinctly noticeable characteristics and can usually be recognized by their                     . speed-limiting governors and closed impellers large suction chambers and impeller eyes multiple impellers and pump shaft positions open impellers and power ends
286 Condensate return lines from tank heating coils are led to the                      . atmospheric drain tank main condenser DC heater contaminated drain system
287 Contaminated steam generators in a contaminated drain system are usually                     . single effect double effect triple effect multistage flash type
288 Cooling water to the vent condenser in a DC heater is supplied by the                . salt water circulator main feed pump feed booster pump main and/or auxiliary condensate pump
289 Corrosion due to electrolytic action in modern water-tube boilers is uncommon because                     . boiler water is a strong electrolytic alkalinity control treatment prevents electrolytic action boiler components are generally constructed of similar metals electrolytic action cannot occur at high pressure
290 Corrosion of the flue gas side of the economizer can be a result of the                     .  I. stack gas temperature being lower than the dew point II. feed water temperature being excessively cool I only II only both I and II neither I or II
291 Cratering and water tracking in boiler tubes is caused by                     . burning a fuel with a high vanadium content baked on slag deposits soot corrosion water trapped between tubes and refractory
292 Damage to deck machinery from water hammer developing in the steam lines can be prevented by                     . installing a steam strainer in all exhaust lines opening machinery throttle valves rapidly draining the steam piping before operating any machinery ensuring that all drain lines are properly insulated
293 Damaging scale can form on the interior of superheater tubes as a result of                     . leaks from the desuperheater high superheater outlet temperature insufficient steam flow through the superheater boiler water carryover
294 Deaeration of condensate primarily occurs in what section of the illustration shown. DFT main condenser hot well distilled water tank first stage feed heater
295 Depending upon the design of the boiler, the constant pressure maintained at the steam drum or the superheater outlet is known as the                     . designed maximum pressure overload pressure operating pressure output pressure
296 Desuperheated steam can be found at the                     . main steam stop generator steam stop spray attemperator outlet high pressure turbine steam chest
297 Desuperheated steam from the control desuperheater is returned to the main superheater to control the outlet temperature by the action of                     . the superheater temperature control valve the superheater flow valves an orifice in the superheater inlet header a diaphragm type pressure controller
298 Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because                     . the boiler must be over fired to maintain the required rate  of steam generation the temperature of the gas leaving the generating banks will be lower than normal the screen tubes absorb excessive heat and transfer the increased temperature to the superheater gas laning will result causing overheating of the superheater
299 Discharging an excessive amount of cold water into the DC heater during normal steaming conditions could cause                     . flashing at the feed pump suction excess oxygen in the feed water water hammer in the economizer increased back pressure
300 Discharging an excessive amount of make-up feed water into the DC heater during normal steaming conditions could cause                      . loss of feed pump suction decreased auxiliary exhaust pressure water hammer in the economizer increased air ejector discharge temperature
301 Dissolved and suspended solids in boiler water are kept at minimum levels by                     . using only volatile chemicals frequently blowing down the boiler treating the boiler water with phosphates the introduction of oxygen scavenging chemicals
302 Dissolved oxygen can be removed from the boiler water by                     . frequent surface and bottom blows dumping and refilling the boiler weekly passing the water through absorbent filters treating the water with chemical scavengers
303 Dissolved oxygen entrained in the feed water entering a boiler can cause                     . erosion localized pitting caustic embrittlement acid corrosion
304 Dissolved oxygen in the condensate can result from                     . steam leaks into the gland leakoff air leaks through the turbine glands improper operation of the gland exhauster vapor lock in the condensate pump
305 Dissolved oxygen in the condensate is generally attributed to                    . steam leaks into the gland leakoff improper operation of the gland exhauster adding make up feed vapor lock in the condensate pump
306 Downcomers are frequently mounted outside the boiler casing on a water-tube boiler for the purpose of                     . reducing heat in the downcomers and improving water circulation improving the cooling of the lower tube banks causing suspended solids in the boiler water to settle in the water drums providing for easy maintenance and repair
307 Downcomers are installed between the boiler inner and outer casing to                     .  I. increase circulation rates II. decrease the amount of heat that they can absorb from the furnace I only II only Both I and II Neither I or II
308 Downcomers are installed between the inner and outer boiler casings to                     .  I. increase the end point of carry over II. decrease the end point of circulation I only II only Both I and II Neither I or II
309 Downcomers are installed between the inner and outer boiler casings to                     .  I. increase the end point of combustion II. increase the end point of carry over I only II only Both I and II Neither I or II
310 Downcomers are installed between the inner and outer boiler casings to                     .  I. increase the end point of combustion II. increase the end point of circulation I only II only Both I and II Neither I or II
311 Downcomers are used in modern boilers to                     . circulate water to the mud drum cool the superheater preheat the feed water remove soot from the firesides
312 Downcomers installed in water-tube boilers function to                     . distribute feed water within the water drum decrease the end point for moisture carryover accelerate the generation of superheated steam accelerate water circulation in the boiler
313 Downcomers installed in water-tube boilers function to                     . distribute feed water within the water drum decrease the end point for moisture carryover cool the tubes adjacent to the burner throats ensure proper circulation to the water wall headers
314 Due to of the curing characteristics of plastic refractory, its use should be avoided in                     . high temperature areas burner fronts small repairs low temperature areas
315 During cold ship start-up, you should open the feed water outlet and condensate valves to a DC heater in order to                     . avoid running the feed pump 'dry' expel non-condensable vapors from the vent thoroughly atomize incoming condensate prevent excessive pressure
316 During each two and one-half year inspection, which test or examination of a cargo vessel water tube boiler is required by Coast Guard Regulations (46 CFR)? Accumulation test Uptakes structural survey Hydrostatic test Fireside inspection
317 During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed? Turbine exhaust valve Turbine steam supply valve Pump suction valve Pump discharge check valve
318 During initial starting of the standby turbine-driven feed pump, which of the listed valves should remain closed? Pump discharge check valve Turbine steam supply valve Turbine exhaust valve Pump suction valve
319 During normal operation, the steam flow from the auxiliary exhaust line to the DC heater can be closely related to the               . spring pressure of the spray valves water level in the DC heater reservoir the temperature and quantity of the condensate flow to the DC heater rate of evaporation in the DC heater
320 Economy and efficiency in the operation of a marine boiler have traditionally been characterized by                     . a clear stack (invisible stack gases) maintaining the fuel oil temperature as high as possible a light brown haze from the stack a slight wisp of white smoke from the stack
321 Efficient boiler operation is indicated when the percentage by volume of carbon dioxide present in combustion gases is between                     . 1 and 10 10 and 11 12 and 14 15 and 17
322 Efficient combustion in a boiler is indicated by a                     . white haze brown haze yellow haze black haze
323 Eight (8) ounces of oxygen, dissolved in 500,000  pounds of water, is a concentration of                     . 1.0 ppm 4.0 ppm 8.0 ppm 16.0 ppm
324 Electrolytic corrosion in the condenser circulating water system can be reduced by                     . decreasing the velocity of the circulating water through the waterboxes using zinc plates in the waterboxes chemically treating the condensate formed in the hot well decreasing the volume of water in the system
325 Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an                      . engineer's assistance- needed alarm gyrocompass system alarm satellite telecommunications alarm all of the above
326 Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an                      . satellite telecommunications alarm remote vital system alarm gyrocompass system alarm all of the above
327 Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an                      . gyrocompass system alarm satellite telecommunications alarm personnel alarm all of the above
328 Excess air must be provided to an operating boiler to allow for                      . complete combustion of fuel fluctuations in boiler steam demand heat losses up the stack all of the above
329 Excess free oxygen in the boiler feed water can be the result of                       . improper operation of the DC heater steam leaks through the turbine glands improper operation of the gland exhauster vapor lock in the boiler feed pump
330 Excessive accumulation of carbon deposits on a boiler burner throat ring and diffuser could result in                     . too much excess combustion air a reduced boiler fuel oil pressure a decrease in boiler efficiency increased heat transfer and overheating
331 Excessive alkalinity of boiler water will cause                 . caustic embrittlement scale formation calcium carbonate precipitation sodium sulfite reacting with dissolved oxygen
332 Excessive carbon dioxide formed by improper chemical treatment in the boiler, may cause corrosion in the                     . condensate lines boiler superheater tubes boiler generating tubes main and auxiliary steam lines
333 Excessive combustion air in a boiler is indicated by the flame ends appearing as a/an                     . shower of sparks orange colored flame dull red or black flame light brown flame
334 Excessive condensate depression can result in                     . overheated air injectors high condensate discharge temperature decreased plant operating efficiency insufficient condensate sub cooling
335 Excessive condensate depression will result in                     . increased oxygen rejected in the condenser decreased steam consumption excessive condensate temperatures increased air absorption by the condensate
336 Excessive foaming in a steaming boiler can cause damage to the                      . superheater desuperheater economizer internal feed pipe
337 Excessive recirculation of condensate should be avoided, as it can cause                     . excessive cooling of the condensate overheating of the air ejectors the condenser hot well to be completely drained at low speeds overheating of the vent condenser
338 Excessive soot accumulations on boiler generating tube surfaces can result in                     . high superheater outlet temperature incomplete combustion in the furnace reverse circulation of the steam and water mixture low stack gas temperature
339 Excessive soot deposits on the heating surfaces of a boiler uncontrolled interdeck superheater would be indicated by                     . decreased fuel oil and air requirements increased stack temperature increased desuperheated steam temperature increased superheater outlet temperature
340 Excessive water flow beyond the design limits of a feed water heater, will be indicated by a/an                     . increase in the pressure drop between the water inlet and outlet decrease in the pressure drop between the water inlet and outlet excessive gas liberation from the waterside vents high steam temperature at the heater outlet
341 Excessive water loss from the main feed system can be caused by                     . an atmospheric drain tank trap frozen in the closed position excessive recirculation of condensate from the outlet of the air ejector condenser to the main condenser a vapor bound main condensate pump a leak in the desuperheater internal gasket
342 Excessively hot water returning to an atmospheric drain tank indicates                     . a heating coil has ruptured a steam trap is hung open there is a loss of circulating water the condensate recirculating valve is open
343 Excessively hot water returning to an atmospheric drain tank indicates                     . the condensate recirculating valve is open there is a loss of circulating water a steam trap is hung open a heating coil has ruptured
344 Failure of the fuel oil service pump to maintain fuel oil flow to the burner could be caused by                     . a high relief valve setting excessive return line oil pressure dirty fuel oil strainers excessive fuel pump speed
345 Failure to remove calcium and magnesium from feed water before it reaches the boiler can result in tube                     . scaling pitting sludging erosion
346 Feed water heaters are used aboard steam vessels to reduce thermal shock to the boiler and to                     . increase plant mechanical efficiency act as a heat sink for turbine bleed steam improve thermal efficiency reduce back pressure in the auxiliary exhaust line
347 Feed water is deaerated to prevent                     . cavitation in the feed pump corrosion in the boiler loss of system vacuum all of the above
348 Ferrous sulfate tends to go into solution in boiler water when the value of the hydrogen ion concentration increases. Consequently, the water in a 900 psi boiler should be               . pure with zero pH value pure and treated to a pH value of 4.0 to 4.5 maintained at a pH value of 7.0 pure and treated to a pH value of 10.5 to 11.0
349 Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the                     . fuel oil back pressure air volume regulators fuel/air ratio knob forced draft fan dampers
350 Fireside burning of boiler superheater tubes is a direct result of                      . combustion gases impinging on the tubes fuel droplets striking the hot tubes heating carbon steel tubes above 750F tubes becoming steam bound
351 Fireside burning of boiler tubes can be a result of                     . slag deposit improper atomization soot accumulations waterside deposits
352 Fireside burning of boiler tubes is usually the direct result of                     . soot accumulations on a tube bank overheating due to poor heat transfer oxygen corrosion slag accumulation on the firesides
353 Fireside burning of boiler tubes is usually the direct result of                     . high furnace temperatures gas laning in tube banks oxygen corrosion of metallic surfaces overheating due to poor heat transfer
354 Flame scanners are used with boiler combustion control systems to monitor flame quality and to                     . shut off the fuel supply if flame failure is detected secure the fuel oil service pump in the event of a floor fire secure the forced draft fan in the event of a flame failure regulate the fuel/air ratio controller for more efficient combustion
355 Flooding of the DC heater, due to the addition of excessive makeup feed, is normally corrected by the use of                     . a condensate pressure regulating valve a thermostatic steam regulating valve the feed pump recirculating line a manual or automatic dump valve to the reserve feed tank or distilled tank
356 Fluctuations in the atomizing steam pressure at the burners could be caused by a/an                     . malfunctioning condensate drain in the atomizing steam system incorrectly assembled air register partially closed atomizing fuel valve partially opened recirculating valve
357 Fluctuations in the atomizing steam pressure at the burners could be caused by a/an                     . malfunctioning steam trap in the atomizing steam system incorrectly assembled air register partially closed atomizing fuel valve partially opened recirculating valve
358 Foaming and moisture carryover in a boiler can be caused by an                      . excessive amount of dissolved solids in the boiler water excessive acidity level in the boiler water inadequate amount of dissolved oxygen in the boiler water inadequate alkalinity content in the boiler water
359 Foaming in a boiler can be caused by                     . high total solids high alkalinity excessive phosphate all of the above
360 Foaming in boiler water is a result of                     . carryover excessive suspended solids low water level excessive surface blows
361 Foaming in boiler water is caused by                     . neutral water acidic contamination high boiler water alkalinity low boiler water alkalinity
362 From which of the areas listed are condensate drains normally collected and returned to the atmospheric pressure drain system? Steam whistle separator/trap Each main feed pump steam supply line Steam systems operating in excess of 150 psi Main and auxiliary air ejector aftercondensers
363 From which of the areas listed are condensate drains normally collected and returned to the low pressure drain system? Steam whistle separator/trap Each main feed pump steam supply line Steam systems operating in excess of 150 psi Main and auxiliary air ejector aftercondensers
364 Fuel oil accumulation in a boiler double front is generally caused by                     . leaking fuel oil strainers low return line pressure dripping atomizers insufficient air
365 Fuel oil atomizers are used in boilers to                     . control the temperature of fuel entering the furnace control the amount of air entering the furnace mix air and fuel together break fuel oil into a fine spray
366 Fuel oil is heated before atomizing to                     . reduce the viscosity increase the viscosity raise the fire point lower the flash point
367 Fuel oil is heated before it reaches the burners to                     . increase its heating ability make it atomize properly raise its ignition temperature boil off water contamination
368 Fuel oil is transferred from storage tanks to the settling tanks to allow for                     . blending with atomizing steam purging of any large air bubbles that have formed heating to separate water and sediment heating to the correct temperature for proper atomization
369 Fuel oil is transferred to the settling tanks for                     . the purpose of removing any volatile gases present in the fuel purging of any large air bubbles that have formed heating to allow water and sediment to settle out heating to the correct temperature for proper burner atomization
370 Fuel oil may be discovered in the contaminated drain inspection tank when the                     . steam atomizer leaks fuel oil heater leaks DC heater leaks steam operated fuel oil pump leaks
371 Fuel oil passing through the burners is divided into fine particles by the                     . diffuser air register sprayer plate air foils
372 Fuel oil settling tanks are used to                     . store oil for immediate use separate water and solids from the fuel make stripping of sludge and water from fuel oil easier all of the above
373 Fuel oil settling tanks are used to                     . store oil for immediate use precipitate out water and solids facilitate the stripping of sludge and water all of the above
374 Fuel oil solenoid valves at the burner fronts should be of  the manual reset type to                     . permit the operator to secure each burner during a blackout permit the operator to secure each burner after a blackout prevent the furnace filling with oil during a power failure prevent the furnace filling with oil after restoration of power
375 Fuel oil viscosity to the atomizer can be reduced by                     . increasing the fuel oil heater steam supply mixing heavier oil with the fuel changing the atomizer orifice size increasing fuel oil pressure
376 Gasket leakage around boiler handholes may be caused by                     . improper positioning of the gasket pitted seating surfaces loose dogs all of the above
377 Generally, a 12% to 14% content of carbon dioxide in boiler flue gases indicates                     . too much excess air a high vanadium content in the fuel oil proper combustion of the fuel oil carbon deposits in the uptakes
378 Heat blisters forming on the first row of the generating tubes are caused by                     . fireside deposits low water level flame impingement waterside deposits
379 Heat introduced to the condenser by exhausting steam is removed by the circulation of                     . reserve feed water cold condensate low pressure drains seawater
380 Heating the fuel oil to an excessively high a temperature in a fuel oil heater will cause                     . a loss of fuel oil suction over firing the boiler leakage at the burners fouling of the heater
381 Heavy slagging and high temperature corrosion of boiler tubes can result from using a fuel oil with high amounts of                     . ash sodium chloride salts vanadium salts all of the above
382 High boiler water level can cause carryover and                     . damage to the economizer warped screen tubes warped water wall tubes damage to the superheater tubes
383 High pressure and low pressure drain systems are part of the                      . condensate drain system auxiliary turbine bleed system contaminated drain system boiler drain system
384 High pressure steam drains are normally discharged to the                     . DC heater atmospheric drain line reserve feed tank drain and inspection tank
385 High pressure steam drains from systems operating at above 150 psi are normally collected in the                     . atmospheric drain tank contaminated drain inspection tank deaerating feed water heater distilled water tank
386 High salinity can be reduced in a steaming boiler by adding caustic soda, phosphate, and then                     . using the continuous blow down steaming at a low firing rate for 24 hours adding hydrazine to control dissolved oxygen adding calcium carbonate to precipitate solids
387 High temperature at the superheater outlet would be caused by                      . outer casing leakage improper turn down ration rapid fuel oil atomization excessive excess air
388 High temperature at the superheater outlet would NOT be caused by                     . outer casing leakage high feed water temperature poor fuel oil atomization too much excess air
389 How is a diaphragm type steam whistle protected from damage due to entrained condensate? High temperature steam is used in the whistle. Condensate drains from the horn each time the whistle is blown. A water separator is installed in the steam supply line. The diaphragm separates condensate from steam.
390 How is boiler water forced to circulate faster in accelerated natural circulation boilers, than in free natural circulation boilers? Increasing the density of the water. Installing a water circulating pump, such as a hydro-kineter. Increasing the inclined angle of the generating tubes. Increasing the surface area of the economizer exposed to the combustion gases.
391 How is the nozzle in a nozzle reaction safety valve held in place? Press fit Lock nut Machine threads Spot weld
392 Identify the system shown in the illustration. Bleed steam Auxiliary steam High pressure drains Auxiliary condensate
393 Identify the system shown in the illustration. Bleed steam Auxiliary steam High pressure drains Auxiliary condensate
394 If a boiler begins to pant and vibrate you should                     . check the fuel oil service pumps secure the fires increase the air reduce the steam demand
395 If a boiler fire is blown out by a flareback, you should immediately                     . increase the forced draft blower speed start the standby fuel oil pump secure the fuel supply to the boiler burners relight the fires with a torch
396 If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240F? 30.5 Btu/lb 116.5 Btu/lb 582.7 Btu/lb 983.4 Btu/lb
397 If a boiler is being operated with the inlet feed water bypassing the economizer,  which of the following is true? The fuel consumption will increase for the same boiler load. There is always the danger of burning the economizer tubes. Less heat is actually being transferred to the superheated steam because of the decrease in feed water flow all of the above
398 If a boiler is being steamed at a high firing rate, blowing down a water wall header without taking any other precaution could result in                     . excessive strain on boiler blow down lines erratic operation of the automatic feed water regulating valve load imbalance between other boilers on the line interruption of water circulation
399 If a boiler is brought on the line with its steam pressure much higher than that of the boiler already on the line, there is danger of                     . thermal shock priming and carryover low water an overloaded superheater
400 If a boiler is panting, which of the following actions should be taken? Decrease the air pressure to the burners. Increase the air pressure to the burners. Increase the fuel oil pressure. Increase the fuel oil temperature.
401 If a boiler is smoking black and increasing the boiler front air box pressure does not reduce the smoke, the cause can be                     . forced draft fan failure dirty atomizers heavy soot on tubes high ambient air temperature
402 If a boiler is smoking black and increasing the boiler front air box pressure does not reduce the smoke, the cause can be                     . forced draft fan failure heavy soot on tubes low fuel oil temperature high air heater temperature
403 If a boiler superheater safety valve is leaking at normal working pressure, the quickest method of determining and possibly solving the problem is to                     . blow out the valve by several short lifts with the hand lifting gear fully open the superheater safety drain valve for several seconds lower the firing rate until the leakage stops raise the firing rate until the leakage stops
404 If a boiler tube bank baffle carries away, or burns through, there will be                     . incomplete combustion localized overheating of the water drum excessive gas turbulence in the furnace fireside burning of boiler tubes
405 If a burner were inserted too far into the boiler furnace,  it could cause carbon deposits on the                     . furnace opening burner tip air cone register doors
406 If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur? A decreased water level in the DC heater. An increased water level in the steam drum. Flashing at the suction side of the pump. Excessive diaphragm seal wear in the feed water regulator.
407 If a feed pump failure causes the boiler water to drop out  of sight in the gage glass, the engineer should FIRST                     . secure the fires, steam stops and then add water secure the fires, reduce steam load and start standby feed pump reduce the steaming rate and then cool the boiler with the  force draft fan reduce the steaming rate and then add water
408 If a large number of tubes fail in a steaming boiler, the                     . steam pressure will rise rapidly fires will always be extinguished water level will drop rapidly fires will hiss and sputter
409 If a large number of tubes has failed, you can minimize damage to a boiler by                     . securing the fires, steam stops, and relieving boiler pressure securing the fires, feed stops, and leaving the boiler cut  on the line increasing the feed water supply to keep the boiler cool speeding up the forced draft fans to blow steam up the stack
410 If a main condenser were operating with a vacuum of 28.09 in. Hg, a condensate discharge temperature of 95F, a seawater inlet temperature of 64F and an overboard temperature of 72F, which of the following would represent the condensate depression? 0.3 in. Hg 0.5 in. Hg 5.5F 3.24F
411 If a major flareback occurs to a boiler, which of the following actions should be immediately taken? Secure the forced draft fan. Secure the fuel to the burners. Secure all fire room ventilation. Purge the fuel oil system.
412 If a pressure drop does not exist across the superheater in a steaming boiler                     . this is a normal condition the drum safety valve is about to lift ahead of the superheater safety there is no steam flow through the superheater the feed water temperature is too low
413 If a quantity of saturated steam consists of 90 percent steam and 10 percent moisture, the quality of the mixture is                     . 10% 80% 90% 100%
414 If a routine boiler water test indicates high salinity, you should blow down the boiler to reduce salinity and then                     . add carbonates to control sludging treat the boiler water with phosphates reduce the firing rate to prevent scaling increase the firing rate to prevent foaming
415 If a salinity alarm system indicates 2.5 grains per gallon at the main condensate pump discharge, your first action should be to                     . blow down the boilers and add make up water chemically test the condensate for chloride content increase the hydrazine dosage in the condensate line open the main condensate recirculating valve
416 If a ship is to be laid up for an indefinite period, the saltwater side of the main condenser should be                     . left filled with saltwater with the sea valves closed left filled with saltwater with the sea valves open drained and refilled with saltwater after closing the sea valves drained and dried out after closing the sea valves
417 If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be                     . filled with moist air left under a vacuum completely drained of water pressurized to approximately 5 psig with nitrogen, 99.5% pure by volume
418 If a soot blower element does not revolve freely, the most likely cause would be                     . a seized blower head bearing an improper blowing arc cam setting warpage of the soot blower element insufficient steam pressure to the soot blower element
419 If a steaming boiler begins 'panting,' the probable cause is                     . too much air for proper combustion excessively high furnace temperature excessively high fuel oil temperature insufficient air for proper combustion
420 If a steaming boiler is not supplied with sufficient air for proper combustion, the                     . boiler will pant and rumble fires will hiss and sputter boiler will smoke white fires will be too hot
421 If a tube failure results from low water level and the water level can not be maintained in sight in the gage glass, you should                     . immediately secure the forced draft fans increase the feed pump speed to maximum immediately secure the fuel oil supply to the burners blow down the gage glass to verify a low water condition
422 If a tube failure results from low water level and you cannot maintain water in sight in the gage glass, you should                     . immediately secure the forced draft fans increase the feed pump speed to maximum immediately secure the fuel oil supply to the burners blow down the gage glass to verify a low water condition
423 If a vessel is steaming at a steady rate, and the water level has dropped out of sight in the boiler gage glass, the FIRST corrective action should be to                     . open the feed water bypass regulator blow down the boiler gauge glass slow down the engines cut out the fires
424 If a water-tube boiler tube has sagged and must be plugged, a hole must be made in the tube wall to prevent                     . quick burnout of that tube pressure buildup in that tube a complete sagging failure tube cracking due to overheating
425 If an analysis of boiler flue gas determines there is 100% excess air for combustion, you should expect the flue gas to have a nitrogen content of approximately                     . 21.0% 33.0% 79.0% 87.0%
426 If an analysis of boiler flue gas determines there is 50% excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately                     . 79.0% 33.0% 21.0% 14.0%
427 If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately                     . 10.5% 14.0% 21.0% 79.0%
428 If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an                     . faulty pressure signal to the time delay relay circuit dirty flame scanner window burned out solenoid coil in the low fire oil valve excessively high fuel oil temperature
429 If an oil fire occurs in the double casing of a steaming boiler, you should                     . increase the forced draft fan speed secure the feed water supply to the boiler secure the fuel oil supply to the burners apply water with a smooth bore nozzle
430 If an oil fire occurs in the double casing of a steaming boiler, you should                     . increase the forced draft fan speed immediately secure the feed water supply to the boiler secure the fires and air supply and activate the steam smothering system apply water with a smooth bore nozzle
431 If boiler priming occurs, you should immediately                     . increase the steaming rate reduce speed and open throttle drains lift the safety valves with the hand easing gear open the boiler bottom blow valve
432 If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the                     . economizer tubes superheater tubes feed water crossover line internal desuperheater flange
433 If it becomes necessary to remove water from a pressurized main boiler, it should be directed                     . into the bilges overboard through the bottom blow line into the cofferdam into the reserve feed tank
434 If it is necessary to operate a turbine driven main feed  pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating? Throttling of the steam supply valve. Throttling of the liquid discharge valve. A bypass or recirculating line led back to the pump impeller eye or suction. A bypass or recirculating line led back to the source of suction supply.
435 If live steam is supplied directly to the tank heating coils, the collected drains in the 'clean' section of the contaminated drain inspection tank are removed directly to  the                     . main and/or auxiliary condenser atmospheric drain tank deaerating feed water heater makeup feed water tank
436 If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed                       . stop-check valve stop valve pump speed control pump pressure control
437 If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first? Change over fuel supply to diesel fuel. Shift over to the standby heater and monitor contaminated drain tank for additional traces of oil. Bottom blow the boiler using the continuous blow line. Shift over to the low fuel oil suction on the day tank.
438 If oil is observed in the steam drains from a fuel oil heater, you should                     . increase the fuel oil pressure to the heater shift the drains to the atmospheric drain tank transfer operation to another heater and secure the original heater increase the steam pressure to that heater
439 If one burner of a group of operating steam atomizing burners in a steaming boiler is cut out, the register doors for that burner should be                     . left wide open left cracked open closed halfway closed tightly
440 If one fuel oil strainer of a duplex unit becomes clogged while the vessel is steaming at sea, the FIRST action should be to                      . clean the dirty strainer as quickly as possible change the oil flow over to the clean side stop the fuel oil service pump open the strainer bypass valve
441 If one fuel strainer of a duplex strainer unit becomes clogged while your vessel is underway, you should first                     . secure the engine immediately change the oil flow over to the clean side stop the fuel oil pump open the strainer bypass valve
442 If the bellows in a thermo-hydraulic feed water control valve ruptures, the boiler water level will                     . decrease only increase only decrease initially and then increase increase initially and then decrease
443 If the bellows in a thermo-hydraulic feed water control valve ruptures, the boiler water level will                     . increase only decrease only increase initially and then decrease decrease initially and then increase
444 If the boiler fires are extinguished by water contamination in the fuel oil, you should FIRST                     . secure the burner valves secure the settler tank suctions reduce the load on the boiler purge the boiler furnace
445 If the boiler water and condenser hot well levels are normal, but the DC heater level is only 30% of full, you should                     . increase the speed of the condensate pump open the feed pump recirculating valve wide open the makeup feed bypass the vent condenser and third- stage feed heater
446 If the boiler water level is normal, the main condenser hot well level is normal, and the DC heater level is 40% full, you should                     . prime the condensate pump bypass the vent condenser slow the main unit open the makeup feed vacuum drag line
447 If the condensate level in the loop seal of the air ejector intercondenser is lost,                     . no condensate will flow through the system air will be drawn back into the main condenser the air ejector will not transfer heat to the condensate the air ejector will overheat
448 If the condensate level in the loop seal of the intercondenser is lost,                      . no condensate will flow through the system some air will be drawn into the main condenser the air ejector will not operate the air ejector will become overheated
449 If the control air pressure for an automatic combustion control system is lost during maneuvering, you should immediately                     . switch to manual control blow down the air receiver attempt to restart the air compressor secure the boilers
450 If the cooling water flow through the air ejector intercondensers and aftercondensers is inadequate, which of the problems listed will occur? Air ejector nozzles will erode. Aftercondenser will be flooded. DC heater level will rise Main condenser absolute pressure will increase.
451 If the DC heater relief valve lifts frequently, the cause can be excessive                     . condensate supplied to the DC heater auxiliary exhaust steam pressure feed water recirculated from the feed pump makeup feed introduced to the system
452 If the drain regulator used in the operation of the combined L.P. feed water heater, shown in the illustration, is incorrectly set to maintain too high of a level (condensate level covers approximately the lower half of tubes in the first stage heater) the resulting operation will                     . cause no adverse operating effect cause the feed water outlet temperature to decrease cause the feed water temperature to increase above the designed outlet temperature cause the automatic make-up feed valve to cycle open
453 If the engineer on watch has reason to doubt the accuracy of the water level shown in the boiler gage glass, he should                     . speed up the main feed pump open the auxiliary feed line blow down the gage glass start the standby feed pump
454 If the entire pneumatic control to a multi-element feed water regulator fails, the feed water valve is controlled by                     . constant pump pressure regulator remote manual control regulator single-element feed water regulator local manual control
455 If the feed water flow sensor of a multi-element feed water regulator fails, the valve will be controlled as a                     . single element feed water regulator double element feed water regulator triple element feed water regulator local manual control device
456 If the fires in a boiler furnace begin sputtering or hissing, you should suspect                     . excessive fuel pressure at the burners loss of fuel pump suction low fuel oil temperature water contamination of the fuel oil
457 If the fires in both boilers start to sputter, you should immediately                     . shift feed suction to the double bottom speed up the fuel oil pump shift settlers shift to the low suction
458 If the fires start sputtering while steaming under steady conditions, which of the actions listed should be taken? Start the standby fuel oil service pump. Increase the fuel oil pressure. Shift over to another fuel strainer. Shift suction to another settling tank.
459 If the fires to a steaming boiler have been accidently extinguished, you should not relight any burner until                     . all burning embers in the furnace are extinguished the furnace refractory has cooled below ignition temperature the boiler furnace has been thoroughly purged all fuel has been recirculated from the burners
460 If the flue gas oxygen content is too high, you should                   . adjust the combustion control system adjust the fuel oil service system increase the forced draft fan speed increase the fuel oil temperature
461 If the fuel oil temperature flowing to the burners is too low, the                      . fuel service pump will lose suction boiler will produce heavy black smoke boiler will produce dense white smoke fuel service strainers will become clogged
462 If the fuel oil temperature in the fuel oil heater  attains an excessive temperature, what will happen? Carbon deposits will build up on the heating surfaces. The fuel heater relief valve will open immediately. The fuel oil pump will lose suction. The fuel oil recirculating valve will automatically close.
463 If the gage glass water level remains constant in a steaming boiler while maneuvering, the most probable cause is a                     . broken feed water regulator restricted gage glass line properly operating feed pump high water level
464 If the low water level alarm sounds on an automatically fired boiler, and the low water cutout fails to function, you must immediately                     . blow down the gage glass to determine where the water level  is increase the feed water supply to maintain the water level start the emergency feed water injector to restore the normal water level secure the fires to minimize damage to the boiler tubes
465 If the main condenser were operating at a vacuum of 28.5"Hg, a condensate discharge temperature of 86F, a seawater inlet temperature of 72F, and a seawater outlet temperature of 79F, what would be the condensate depression? 0.2 inches Hg 0.7 inches Hg 4 degrees Fahrenheit 7 degrees Fahrenheit
466 If the main condenser were operating at a vacuum of 28.7"Hg, a condensate discharge temperature of 81F, a seawater inlet temperature of 72F, and a seawater outlet temperature of 79F, what would be the condensate depression? 0.2 inches Hg 0.3 inches Hg 4.0 degrees Fahrenheit 12 degrees Fahrenheit
467 If the maximum steam generating capacity of a boiler is increased Coast Guard Regulations (46 CFR) require that the safety valves'                     . lifting pressure be increased relieving capacity be checked reseating pressure be increased blow down be reduced
468 If the maximum steam generating capacity of a boiler is increased, Coast Guard Regulations (46 CFR) require that the safety valves'                     . relieving capacity be checked lifting pressure be increased reseating pressure be increased blow down be reduced
469 If the pressure becomes excessive in the auxiliary exhaust system of a steam propulsion plant, the excess steam will normally be dumped to the                     . deaerating feed tank vent condenser reduced steam system main condenser
470 If the pressure control disk in the soot blower illustrated, is moved to a higher position, the result will                     . cause the soot blower to rotate faster cause the soot blower to rotate slower decrease the amount of steam valve travel increase the steam pressure in the rotating blower element
471 If the salinity indicator located in the main condensate pump discharge piping causes an alarm to sound there is a danger of                      . low condensate depression low condensate temperature salting up the boilers contaminating the distilled tank
472 If the salinity indicator periodically registers high salinity in the main hot well, the cause may be                     . leaking air ejector condenser tubes leaking tubes in the third- stage heater excessive water pressure in the lube oil cooler a contaminated distilled water tank
473 If the stack temperature is higher than normal, this could indicate                     . low fuel oil back pressure too much excess air high feed water pressure external boiler casing leakage
474 If the steam flow input device to a two-element feed water regulator valve fails, the regulator operates as a                     . constant pump pressure regulator remote manual control regulator single-element feed water regulator local manual control
475 If the steam whistle shown in the illustration produces a poor, rattling tone when blown, the probable cause is a/an                     . insufficient steam pressure defective pilot valve excessive back cover tightness a loose back cover
476 If the temperature of the fuel oil entering an atomizer is too low, the burner will                     . produce smoke white require more fuel for atomization produce heavy black smoke at any load condition require more excess air for combustion
477 If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what is the weight of air per pound of fuel when operating a boiler at 5% excess air? 14.44 pounds 15.13 pounds 15.81 pounds 16.50 pounds
478 If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what weight of air will be necessary to burn one pound of fuel to operate a boiler at 10% excess air? 14.44 pounds 15.13 pounds 15.81 pounds 16.50 pounds
479 If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what will be the weight  of the air necessary to burn one pound of fuel when operating a boiler at 15% excess air? 14.44 pounds 15.13 pounds 15.81 pounds 16.50 pounds
480 If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what will be the weight of the air necessary to burn one pound of fuel to operate a boiler at 20% excess air? 14.44 pounds 15.13 pounds 15.81 pounds 16.50 pounds
481 If the water level cannot be seen in the lower part of the boiler gage glass, which of the following actions must be carried out immediately? Increase the feed water going to the boiler. Check the DC heater water level. Blow down the boiler. Secure the boiler fires.
482 If the water level in a steaming boiler is dropping rapidly and cannot be kept at the normal level by standard practices, you should                     . secure the fires and then secure the steam stop secure the steam stop and then secure the fires lowdown the gauge glass to find the true water level speed up the feed pump to raise the water to normal
483 If the water level in one boiler of a two boiler plant rapidly falls out of sight, which of the following actions should be carried out FIRST? Secure the fuel oil to that boiler. Raise the feed pump pressure. Blow down the gage glass. Secure the steam stop to that boiler.
484 If the water level in the boiler water gage glass is not in sight, and the automatic feed water regulator is in the closed position, the                     . safety valve should be lifted by hand fires should be shut off boiler water gage is faulty bottom blow should be opened
485 If there is a sudden drop in the outlet temperature of an uncontrolled superheater, you should                     . increase the firing rate bypass the air heater check for high water level in the drum reduce the forced draft fan speed
486 If water hammer develops while opening the valve in a steam line, which of the following actions should be taken? Shut the steam valve at once, open the drain valve until all moisture is drained, shut the drain line valve, and slowly open the steam valve again. Continue to fully open the steam valve and partially open the drain line valve until all moisture is drained and then  shut the drain line valve. Stop opening the steam valve, open the drain line valve, resume opening the steam valve slowly, and shut the drain line valve after the steam valve is open fully. Increase the speed of opening the steam valve to rapidly heat the line to stop the water hammer.
487 If water hammer develops while opening the valve in a steam line, which of the following actions should be taken? Shut the steam valve at once, open the drain valves until all moisture is drained, shut the drain line valves, and slowly open the steam valve again. Continue to fully open the steam valve as the drain line valves are opened until all moisture is drained, shut the drain line valves. Stop opening the steam valve, open the drain line valves, resume opening the steam valve slowly, and shut the drain line valves after the steam valve is open fully. Increase the speed of opening the steam valve to rapidly heat the line to stop the water hammer.
488 If while filling the boiler a newly installed gasket on a water- tube handhole plate weeps, you should                     . coat the gasket with graphite retighten the stud nut with an air wrench use a double gasket center and tighten with correct size wrench
489 If you noted a large difference in the pressures indicated  by a duplex pressure gage to the fuel oil system strainer,  you should                     . increase the fuel pump discharge pressure reduce the firing rate of the boilers shift to a clean fuel oil strainer secure the fuel oil service pump
490 Improper atomization can be caused by                     . low draft air pressure using the same size burner tips in all burners using small sprayer plates dirty sprayer plates
491 Improper boiler feed water deaeration could be directly linked to                     . operating with excessive condensate depression fluctuating deaerating feed tank level as a result of taking on makeup feed too rapidly fluctuating condensate pressure due to not maintaining proper hot well level all of the above
492 Improper fuel oil burner atomization can be generally attributed to                     . low draft air pressure using the same size burner tips in all burners high fuel oil temperature high fuel oil viscosity
493 Improper water washing of the water-tube boiler firesides can cause                     . sulfuric acid corrosion decreased heat transfer capabilities erosion of tubes and drums loss of ductility in boiler tubes
494 In a "D" type marine boiler, operating under constant load, which of the following conditions could cause the superheated steam temperature to rise above normal? High feed water temperature Insufficient combustion air Low feed water temperature DFT excessive vapor pressure
495 In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should                     . wedge the valve in the open position and report it to the chief engineer bypass the solenoid valve and enter the fact in the logbook secure the burner and determine the cause of the valve failure wedge the valve in the open position and reduce the fuel oil pressure at that burner
496 In a boiler equipped with a convection type superheater, the superheater tubes are located                     . in a position screened from the furnace flame in the direct path of radiant heat flow in a separately fired convection furnace on the fireside of the screen tubes
497 In a boiler equipped with a convection type superheater, the superheater tubes are located                     . in the path of the radiant heat of combustion between the downtake nipple and circulator tube in a position screened from the furnace between the economizer and generating tubes
498 In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by                     . high solids content and foaming in the drum ruptured feed water control valve diaphragm low feed water temperature high feed water temperature
499 In a boiler furnace, incomplete combustion due to insufficient air yields an excess amount of                     . carbon dioxide carbon monoxide nitrogen oxide sulfur dioxide
500 In a boiler water gage glass, a ball check valve is installed on the                     . top connection only bottom connection only top and bottom connection drain valve
501 In a boiler, water flows downward in tubes furthest from the fires and flows upward in tubes nearest the fires because                     . water is denser in the tubes farthest from the fires water is less dense in the tubes farthest from the fires tubes farthest from the fires have a greater diameter tubes farthest from the fires have a smaller diameter
502 In a closed feed and condensate system, to where do the main air ejector after condenser drains directly drain? auxiliary condenser loop seal atmospheric drain tank deaerating feed tank
503 In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level? Steam leaking from the turbine glands. Marine growth on the cooling water side of the main condenser. Condensate recirculating back to the condenser during maneuvering. Steam pressure to air ejectors maintained at 10 psig above  designed supply pressure.
504 In a closed feed water system, the greatest deaeration of condensate occurs in the                     . DC heater atmospheric drain tank air ejector condenser vent condenser
505 In a closed steam and water cycle, which of the conditions listed could prevent main condenser vacuum from reaching the desired level? Excess steam leaking from the turbine glands. Abnormally low atmospheric drain tank level. Main condensate recirculating valve open during maneuvering. Dirty boiler economizer tubes.
506 In a DC heater, which source of steam is commonly used to heat and deaerate condensate? Root steam Auxiliary exhaust steam Main steam Auxiliary steam
507 In a D-type boiler, which of the tubes listed would be located in the generating tube bank? Water walls Superheater support tubes Downcomer tubes Recirculating tubes
508 In a huddling chamber safety valve, the initial valve opening is caused by                     . static pressure acting on the compression screw steam pressure acting on the increased surface area of the  projecting feather steam flow passing through the calibrated adjusting ring steam pressure acting on the exposed bottom area of the valve disk
509 In a huddling chamber type safety valve, initial valve opening is caused by static pressure acting on the                     . valve disk nozzle ring adjusting ring compression screw
510 In a main propulsion steam turbine installation, the condensate pump initially discharges to the                     . air ejector condenser deaerating feed tank first stage heater distillate tank
511 In a marine boiler equipped with mechanically atomized burner assemblies, proper combustion depends on the                     . design and mechanical construction of the atomizers speed of the forced draft fan and quantity of excess air centrifugal force imparted to the oil in the atomizer all of the above
512 In a marine boiler equipped with mechanically atomized burner assemblies, proper combustion depends on the                     . fuel oil pressure speed of the forced draft fan and quantity of excess air temperature of the fuel oil all of the above
513 In a marine boiler, maximum heat transfer rates can be obtained by                     . maintaining the recommended boiler water pH treating the boiler water with oxygen scavenging chemicals maintaining feed water temperature of 212F in the  economizer keeping the watersides free from scale deposits
514 In a marine condenser designed with a reheating hot well, the hot well is reheated by                     . recirculation of condensate steam lanes in the condenser a branch line from the air ejector steam supply submerged heating coils supplied with auxiliary exhaust steam
515 In a modern high pressure steam plant, most feed water deaeration takes place in the                     . atmospheric drain tank air ejector condenser DC heater vent condenser
516 In a multi-burner firebox, a burner tip with a worn and enlarged orifice will                     . have no effect on the flow of oil if the proper pressure is maintained result in an uneven flow of oil through the burner cause a high fuel oil return line back pressure cause smokeless and flameless combustion
517 In a multi-burner firebox, a burner tip with a worn and enlarged orifice will                     . have no effect on the flow of oil if the proper pressure is maintained result in an uneven heating of the furnace cause a high fuel oil return line back pressure cause smokeless and flameless combustion
518 In a properly designed boiler, which end point is most likely to occur first? Evaporation Circulation Combustion Moisture carryover
519 In a properly designed boiler, which of the end points should be reached first? Carryover Circulation Evaporation Combustion
520 In a propulsion boiler, diesel oil is generally supplied to the burners when                     . heavy smoking persists lighting off a cold ship a heavy fuel must be blended it is necessary to compensate for overload capacity
521 In a regenerative air heater, air is bypassed around the heater while                     . operating at low steaming rates blowing tubes crossing over forced draft fans giving a surface blow
522 In a single furnace boiler, where is the steam typically cooled for use as auxiliary steam? Superheater Desuperheater Condenser Air ejector
523 In a single-element feed water regulator, the amount of valve opening and closing is controlled by the                     . water level in the drum steam pressure in the drum steam flow from the boiler feed water flow to the boiler
524 In a steadily steaming boiler, carryover is indicated by a/an                     . inability to maintain boiler chemistry sudden increase in superheater outlet temperature sudden decrease in superheater outlet temperature sudden decrease in drum level
525 In a steam assist atomizer, the fuel oil/steam mix takes place entirely within the                     . tangential slots mixing chamber whirling chamber fuel oil swirlers
526 In a steam assist fuel oil atomizer, the steam pressure is higher than the oil pressure at                     . design boiler load minimum boiler load high fuel viscosity low fuel viscosity
527 In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the                     . main condenser main feed pump distilling plant air heaters
528 In a steaming boiler most dissolved chlorides tend to concentrate at or near the                     . tube joints feed pipe mud drum water surface
529 In a steaming boiler, higher than normal stack gas temperature can be caused by                     . low steam demand excessively high fuel oil temperature too much excess air delayed burning due to inadequate excess air
530 In a steaming boiler, most dissolved chlorides tend to concentrate at, or near, the                     . tube joints mud drum water surface floor tubes
531 In a water tube boiler, circulation is developed by the difference in the                     .  I. tube length and various diameters II. densities of the hot and cold water I only II only Both I and II Neither I nor II
532 In a water tube boiler, waterwall tubes are effectively used to                     .  I. decrease the amount of refractory material necessary in non-waterwall installations II. allow for significant increases in the combustion rates I only II only Both I and II Neither I nor II
533 In a water-tube boiler, circulation is caused by the difference in the                      . area and length of the water-tubes densities within the circulating water heights of the boiler drum angle of inclination of the tubes
534 In a water-tube boiler, sludge is most likely to collect in the                     . generating tubes downcomer tubes screen tubes floor tubes
535 In a water-tube boiler, waterside scale formation is caused by                      . sodium phosphate calcium sulfate magnesium phosphate sodium hydroxide
536 In accordance with Coast Guard Regulations (46 CFR Part 56), all vessels having oil fired boilers must be equipped with                     . one positive- displacement type fuel service pump Suction and discharge strainers capable of being cleaned without interrupting the oil supply one fuel oil heater if shown that the normally used fuel oil will be of low viscosity all of the above
537 In accordance with Coast Guard Regulations (46 CFR Part 62) for vessels propelled by steam turbines, the navigation bridge primary control system must include safety limit controls for                         . high boiler water levels low boiler water levels low steam pressure All of the above
538 In accordance with Coast Guard Regulations (46 CFR) all fuel oil service piping in the vicinity of the burners must                     . utilize leak proof gaskets in all joints have all joints seal welded have wrap around deflectors on all bolted flanged joints be provided with coamings or drip pans
539 In accordance with Coast Guard Regulations (46 CFR), all vessels having oil fired main propulsion boiler(s) must be equipped with                     . at least two fuel service pumps at least two fuel oil heaters a suction and discharge duplex strainer all of the above
540 In accordance with Coast Guard Regulations (46 CFR), the maximum allowable working pressure of a water-tube boiler must be stamped on the                     . burner front lower header name plate drum head
541 In accordance with Coast Guard Regulations (46 CFR), which  of the following materials may be used in short lengths between the fuel oil boiler front header manifold and the atomizer head to provide flexibility? Copper tubing Annealed copper nickel Nickel copper All of the above
542 In accordance with Coast Guard Regulations (46 CFR), which  of the following statements is true concerning safety valve construction and/or operation used on propulsion boilers? Not have threaded inlets for valves larger than 2". Gagging a safety valve by means of a set screw through the  cap when gags are unavailable is acceptable only when conducting a hydrostatic test. After the valve is set and adjusted, the tolerance in popping and reseating pressures shall not vary more than plus or minus 1 1/2%. All of the above.
543 In addition to a nozzle, a fuel oil atomizer uses which of the listed parts? Ignition electrode Burner cone Sprayer plate Air cone
544 In addition to a orifice plate, a fuel oil atomizer uses which of the listed parts? Ignition electrode Burner cone Sprayer plate Air cone
545 In addition to being hazardous to personnel, gas leaks through the boiler casing can also                     . cause overheating of the uptakes impair the effectiveness of the air purge cycle cause improper atomization of fuel oil impair the operation of the high steam pressure limit switch
546 In addition to monitoring flame quality, flame scanners are used in combustion control systems to                     . regulate the air/fuel ratio controller for more efficient combustion secure the forced draft fans upon flame failure automatically open the fuel oil solenoid valves secure the fuel supply in the event of a flame failure
547 In addition to the repeated use of surface blow to control boiler water chemistry, caustic soda may be used to treat high salinity, as well as                     . calcium chromate, for oxygen control phosphate, to aid in scale prevention calcium carbonate, to assist in precipitating solids calcium sulfate to reduce priming
548 In an air register assembly, the majority of air passes through the                     . diffuser or impeller atomizer assembly stationary air foil or blade cone distance piece
549 In an automatically fired boiler, increasing the temperature of the feed water entering the steam drum will ultimately result in a/an                     . increase in the quality of superheated steam increase in fuel consumption decrease in the degree of superheat decrease in the quality of steam entering the superheater
550 In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the                     . steam drum water level steam header pressure master fuel oil solenoid valve position burner flame intensity
551 In an oil fired water-tube boiler, inner casing air leaks can cause                      . oxidation of the exposed furnace walls chilling of the combustion gases excessive feed water consumption localized overheating of tube surfaces
552 In automated boiler operations, a dirty flame scanner will most likely result in                     . increased fuel oil consumption securing fuel oil to the burner loss of forced draft air incomplete purge cycle
553 In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called                     . biasing loading relaying transmitting
554 In most installations, the firing rate of a boiler using steam atomization is indicated by the                     . burner register opening fuel oil supply pressure fuel oil return pressure steam atomization temperature
555 In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because                     . they require more water flow since they are exposed to the greatest heat they must screen the superheater from the direct radiant heat of the burners they must act as downcomers to ensure proper circulation their main function is to retard combustion gas flow for maximum heat transfer rates
556 In order for a maximum number of boiler generating and circulating tubes to be installed without weakening the tube sheet, which of the listed procedures should be carried out? All rows of tubes should be bent at the same angle. All rows of tubes should be installed horizontal to the drum. Different rows of tubes should be bent to enter the drum at any convenient angle. All tubes should be installed normal to the drum surfaces.
557 In order to test the lifting pressure of the deaerating feed heater relief valve, you would                     . I. close the auxiliary exhaust dump valve to the  main and auxiliary condensers II. increase the set point of the make-up steam regulator to the auxiliary exhaust system I only II only Both I and II Neither I nor II
558 In order to test the lifting pressure of the deaerating feed heater relief valve, you would                     .  I.  close the auxiliary exhaust dump valves to the main and auxiliary condenser II.  increase the set point of the reduced steam pressure to the auxiliary exhaust system I only II only Both I and II Neither I nor II
559 In order to test the lifting pressure of the deaerating feed heater relief valve, you would                     .  I.  place a gag on the relief valve II.  increase the set point of the reduced steam pressure to the auxiliary steam system I only II only Both I and II Neither I nor II
560 In preparing to blow tubes at sea, you should                     . increase the firing rate decrease the firing rate increase the forced draft speed decrease the forced draft speed
561 In the absence of the manufacturer's instructions, a good procedure in reassembling a high pressure boiler gage glass is to tighten the nuts in pairs and                     . begin with the center bolts and work toward the ends begin with the end bolts and work toward the center start at the top and work down start at the bottom and work up
562 In the boiler shown in the illustration, the arrow "C" indicates a                      . downtake nipple water wall header sliding foot recirculating header
563 In the boiler shown in the illustration, the arrow "E" indicates a                      . water wall tube recirculating tube support tube downcomer
564 In the boiler steam and water system, pressure is highest in the                      . steam stop dry pipe feed line mud drum
565 In the condensate system, the automatic recirculating valve can be actuated by the                     . DC heater water level superheater steam flow condensate temperature condensate pump discharge pressure
566 In the event of a failure of the pneumatic control system, a multi-element feed water regulator is designed to operate as a                      . constant-pressure regulator constant-volume feed water regulator manually controlled feed water regulator thermo-hydraulic feed water regulator
567 In the majority of marine power plants, the fuel oil heater installations are divided into several units because                     . more heating is required for lower loads auxiliary steam is better utilized in this system plant operation can be continued while repairs are being made to a defective unit oil leakage into the condensate system is less likely with multiple system
568 In the prevention of moisture carryover from a marine boiler, one important consideration is to                     . properly treat the boiler water with hydrazine control the amount of boiler water solids maintain a high boiler water level add foaming agents to the boiler water
569 In the system illustrated the valves at point "A" are                     . swing check/ stop valves stop-check/ stop valves gauge valves/ drain valves globe valves/ gate valves
570 In what section of a boiler would you find a steam quality of 90%? Superheater outlet Desuperheater outlet Steam drum Last pass of the superheater
571 In which of the following types of condensers would you find the cooling water passing through tubes with the turbo generator exhaust steam directed around the outside of the tubes? Jet Barometric Surface Collins
572 In which of the listed components is chemical energy converted to thermal energy with regards to boiler operation? Furnace Superheater Steam drum Economizer
573 In which order should the chemical test analysis of boiler flue gas samples be made? CO2, O2, CO CO, CO2, O2 O2, CO, CO2 CO, O2, CO2
574 Increasing the amount of excess air to a boiler equipped with an uncontrolled interdeck superheater will cause the steam temperature at the superheater outlet to                     . decrease increase decrease momentarily increase momentarily
575 Increasing the blow down of a boiler nozzle reaction safety valve is normally accomplished by                     . increasing the valve spring compression decreasing the valve spring compression raising the adjusting ring lowering the adjusting ring
576 Increasing the temperature of the feed water entering the steam drum will ultimately result in a/an                     . increase in stack gas temperature increase in fuel consumption decrease in the degree of superheat decrease in the quality of steam entering the superheater
577 Insufficient air for combustion in a boiler furnace could result in a                      . white incandescent flame high flame temperature black stack smoke emission 0% carbon monoxide level
578 Insufficient combustion air supply to a boiler furnace can cause                      . low superheater temperature high stack temperature high superheater temperature sputtering fires
579 Insufficient combustion air supply to the furnace would cause                      . the fires to sputter low superheater outlet temperature high stack temperature high feed water consumption
580 Insufficient combustion air supply will cause an atomizer flame to appear as a                     . ragged flame pointed flame dull red flame with black streaks light yellow flame with white streaks
581 Insufficient cooling water circulation through air ejector intercondensers and aftercondensers will cause                     . decreased vacuum in the main condenser overheating of the air ejector nozzles flooding of the aftercondenser flooding of the loop seal
582 Leakage into an internal desuperheater may be caused by                     . steam scrubbers carrying away external corrosion penetrating the desuperheater tube walls chemical feed pipe leaking excess lifting of safety valves
583 Longitudinal expansion of a boiler water drum is allowed for at the boiler                     . tube sheet casing joints foundation sliding feet refractory expansion joint
584 Longitudinal expansion of a boiler water drum is permitted by the                      . tubes casing foundation refractory
585 Low stack gas temperature should be avoided to reduce                     . economizer thermal stress sulfuric acid formation back pressure in the uptakes air heater thermal stress
586 Low stack gas temperatures due to light boiler loads should be avoided in order to reduce the                     . percentage of carbon monoxide in the stack gas formation of dew point sulfuric acid heat loss through the uptakes accumulation of soot
587 Low steam pressure in a steaming boiler can be caused by                     . low steam demand high feed water temperature low water level large sprayer plates
588 Lower boiler efficiency results from carrying too much excess air because                     . it varies the degree of deposits on heat absorbing surfaces it increases the volume and temperature of the furnace gas leaving the stack it decreases the volatility of the fuel the flame temperatures are lower
589 Lower than normal steam pressure in an operating boiler may be caused by                     . a sudden drop in superheater outlet temperature high feed water temperature a low water level in the steam drum boiler water contamination
590 Machinery operating features are designed to help conserve energy. Which of the following will not contribute to a system's thermal efficiency? Reduction of friction. Insulation of hot surfaces. Lubrication of moving parts. Elevation of heat sink temperatures.
591 Main condensate recirculating systems are primarily intended to                     . prevent excessive overheating of the condensate pumps balance and control condensate temperatures at full load provide adequate cooling water for the air ejector  condensers vent accumulated vapors from the condensate pump discharge
592 Main propulsion steam turbine casing drains generally discharge to the                 . contaminated drain tank main condenser bilge atmospheric drain tank
593 Main steam turbine lubricating oil systems are fitted with                     . floating strainers magnetic strainers centrifugal strainers cestus strainers
594 Maintaining low pressure in a condensing turbine exhaust trunk                      . enables better utilization of available heat energy to perform work eliminates creep problems in the exhaust trunk during maneuvering reduces condensate depression with low seawater temperature prevents steam turbulence in the exhaust trunk due to steam laning
595 Makeup feed water is brought into an operating closed feed system via the                     . main feed pump auxiliary feed pump feed booster pump condenser vacuum drag line
596 Many steam plants are designed so that diesel oil can be provided to the burners when                     . heavy smoking persists lighting off a cold ship a heavy fuel must be blended overload capacity is required
597 Maximum heat transfer rates in a marine boiler can be obtained by                     . maintaining the recommended boiler water pH treating the boiler water with oxygen scavenging chemicals maintaining the feed water temperature of 212F keeping the watersides free from scale deposits
598 Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light-off.  This period may not exceed              . 5 seconds 10 seconds 15 seconds 30 seconds
599 Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because                     . residual fuel oils have the same viscosity characteristics regardless of where they are refined the temperature of the fuel oil varies with the flow rate through the heater the relationship between temperature and viscosity varies with different fuels viscosity regulation eliminates the need for close control  of the fuel/air ratio
600 Most marine boilers are designed to produce                     . superheated steam only saturated and superheated steam saturated steam only superheated and supercritical steam
601 Natural circulation in a marine boiler is a result of                     . the difference in the densities of the fluid in the downcomer and riser circuits the fact that the specific weight of steam is greater than  water the velocity imparted to the feed water by the feed pump the turbulence of high pressure feed water entering the steam drum
602 Nichrome wire is used when patching boiler furnaces for                     . anchoring plastic refractory only reinforcing castable and plastic refractory anchoring castable refractory only anchoring castable and plastic refractory
603 Noise caused by condensate striking bends or fittings in a steam pipe line is called                     . condensate depression water hammer piston slap hydraulic lock
604 Normally a boiler water sample should be taken                     . after the boiler has been blown down before the boiler has been blown down or chemicals added when the boiler has been refilled with makeup from the highest point in the feed system
605 Oil accumulation in boiler water would                     . cause foaming and carryover from the boiler increase the heat transfer rate prevent acid attack on the boiler tubes practically eliminate boiler sludge formation
606 Oil in the contaminated drain inspection tank results from                     . a defective relief valve on the fuel oil heater improper drainage of the fuel oil heater coils a leaking heating coil in a fuel oil settling tank operating the fuel oil heater at excessive temperatures
607 Oil or scale deposits on boiler tube walls will cause                     . those tubes to overheat decreased boiler steam pressure increased boiler steam pressure an explosion in the boiler
608 On a boiler equipped with an uncontrolled interdeck superheater, reducing the feed water temperature to the steam drum will cause the superheater outlet temperature to                     . rise decrease rise momentarily then decrease remain constant
609 On a boiler equipped with pilot actuated safety valves, which of the valves listed will be actuated first? Drum safety valve Superheater safety valve Pilot actuated safety valve for the superheater safety valve Pilot actuated safety valve for the drum safety valve
610 On a boiler safety valve, the blow down adjusting ring is locked in place by a                     . set screw locknut wire seal cotter pin
611 On an automatically fired boiler, the loss of forced draft  fan will result in which of the listed actions to be carried out? Stopping of the feed pump Stopping of the fuel oil service pump Closing of the master fuel oil cutoff All of the above.
612 On an operating boiler, the superheater safety valve shown in the illustration is set to lift at 670 psi and reseat at 630 psi. To increase the lifting pressure to 700 psi, but maintain the previous reseat pressure, you would turn the compression screw                      . in the clockwise direction only in the counterclockwise direction only clockwise direction and lower adjusting ring counterclockwise direction and raise the adjusting ring
613 Once a huddling chamber type safety valve has begun to initially open, it will then pop open due to the                     .  I. expansion of the steam leaving the nozzle II. forces exerted on the projecting lips I only II only Both I and II Neither I nor II
614 One advantage of installing water wall tubes in a boiler furnace is to                     . increase furnace size reduce furnace temperature decrease refractory maintenance reduce combustion rates
615 One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to                     . secure the forced draft fans stop the fuel oil service pump secure the feed water supply to the boiler close the main steam stop
616 One factor for determining the minimum feed water inlet temperature to a boiler economizer is the                     . dew point temperature of the stack gases superheater inlet temperature temperature of steam bled off the LP turbine desuperheater outlet temperature
617 One function of a steam drum desuperheater installed in a high pressure boiler would be to                     . maintain the essential flow of feed water into the drum raise the boiler water temperature in the steam drum lower the temperature of the steam entering the superheater lower the temperature of the steam in the steam drum
618 One function of the air and flue gas bypass dampers installed in regenerative type air heaters is to                     . avoid excessive cooling of the stack gases during low load operation regulate combustion air temperature at normal firing rates reduce the load on the element drive motor reduce the temperature of the double undulated heating elements
619 One function of the component labeled "C" shown in the illustration is to                     . act as a foundation beam to support the weight of the boiler provide a collecting area for sediment and sludge cool the refractory form a soot seal in the lower corner of the boiler casing
620 One function of the desuperheater installed in a boiler steam drum is to                     . raise the temperature of the steam in the dry pipe distribute feed water within the boiler provide steam for auxiliary machinery add moisture to superheated steam
621 One function of the internal fitting labeled "C" shown in  the illustration is to                     . reduce high water level in an emergency pass generated steam to the superheater remove scum from the water surface distribute feed water throughout the drum
622 One of the basic rules applying to the operation of a single- pass main condenser, is that the                     . cooling water overboard should be about 10F higher than the inlet temperature vacuum must be maintained at 29.92" of Hg. under all operating conditions quantity of reheating steam flow through the condenser must be maintained at maximum under all operating conditions condensate temperature must never be allowed to drop below 104F
623 One of the functions of a boiler desuperheater installed in a high pressure boiler is to                     .  I. maintain the essential flow of feed water into the drum II. heat the boiler water in the steam drum I only II only Both I and II Neither I nor II
624 One of the important functions of the superheater safety valves is to                     . maintain a constant steam flow in the desuperheater protect the desuperheater from overheating protect the superheater from overheating maintain a constant steam flow in the auxiliary steam line
625 One of the operating conditions sensed by a two-element feed water regulator is                     . feed water flow steam flow fuel pressure steam pressure
626 One of the purposes of chemically treating boiler water is to                     . reduce blow down frequency reduce scale formation eliminate waterside cleaning constantly decrease alkalinity
627 One purpose of a desuperheater installed in a boiler steam drum is to                     . protect the superheater from overheating increase the boiler efficiency add moisture to superheated steam remove all superheat from generated steam
628 Overheating of the generating tubes will occur when a boiler reaches its end point of                     . evaporation circulation combustion moisture carryover
629 Panting in an oil fired marine boiler can be caused by                     . excessive combustion air supply low fuel oil temperature fouled burner sprayer plates insufficient combustion air supply
630 Panting or rumbling in a boiler furnace is usually caused by                     . too much air not enough air low fuel temperature low fuel pressure
631 Phenolphthalein indicator is used in the boiler water test  for                     . dissolved oxygen alkalinity chloride content hardness
632 Phenolphthalein is used as an indicator to test boiler water for                      . hardness alkalinity hydrazine chloride content
633 Phosphates are used in the chemical treatment of boiler water to                     . control alkalinity and neutralize vanadium convert scale forming salts to relatively harmless sludges neutralize the harmful effects of hydrogen embrittlement decrease dissolved oxygen content
634 Poor atomization accompanied by an elongated flame from a steam atomization burner is MOST likely caused by                     . the fuel oil temperature being too low improper operation of traps in atomizing steam return piping the forced draft fan too slow for the boiler load an improper cetane number
635 Prior to lighting a burner in a cold boiler, you should                     . close the superheater vent blow down the mud drum open the surface blow valve thoroughly purge the furnace
636 Proper bracing and support of the boiler safety valve escape piping is necessary to                     . prevent condensate from accumulating in lines prevent stressing of the safety valves allow for back pressure formation in the line prevent scale from lodging on the valve seat
637 Proper lagging of a single-element feed water regulator is accomplished by applying the insulation material                     . to the steam connection, but not water connection to the water connection, but not steam connection to both connections, including finned areas only as necessary to prevent possible injury
638 Proper use of the boiler surface blow will                     . remove most precipitated solids remove floating impurities from boiler water disrupt circulation in a steaming boiler have no effect on boiler alkalinity
639 Proper vacuum must be maintained in the main condenser to                      . run auxiliary machinery maintain plant efficiency utilize circulating seawater cool the lube oil supply
640 Pulsating boiler furnace fires can be caused by                     . low fuel temperature too much air low fuel pressure too little air
641 Pumps normally used for fuel oil service are                     . positive displacement rotary pumps two-stage centrifugal pumps explosion proof gear pumps non-vented plunger pumps
642 Radial cracks have developed in the castable refractory of the burner cones after the first firing since the installation of new furnace front refractory.  This is an indication of                     . a need for plastic firebrick patchwork inadequate cone angle a need for castable refractory patchwork relieved stresses
643 Rapid fluctuation in the superheater temperature of a steady steaming boiler indicates                     . moisture carryover improper positioning of superheater fires leaky desuperheater tubes leaky superheater tubes
644 Rapid fluctuation of the superheater outlet temperature can be caused by                     . a dirty economizer intermittent water carryover excess air dirty watersides
645 Rapidly discharging condensate into the DC heater during normal steaming conditions could cause                     . decrease in auxiliary exhaust pressure decrease in dissolved oxygen in the feed water water hammer in the economizer increase in auxiliary exhaust pressure
646 Reaching which 'end point' will result in the most severe damage to the boiler? Circulation Carryover Combustion Atomization
647 Reaching which of the boiler end points listed could cause the most damage to a boiler? Combustion Moisture carryover Circulation Heat transfer
648 Recirculation of the feed water ensures a flow of water through the                     . main feed pump economizer standby feed pump suction line third stage heater
649 Regarding the boiler shown in the illustration, the burners are to be placed at                     . arrow "F" arrow "K" arrow "L" none of the above
650 Relief valves in the fuel oil service system discharge to either the service pump suction or the                     . settling tanks recirculating line simplex fuel oil strainer slop retention tank
651 Remote water level indicators, operate on the principle of                     . different refractive properties of steam and water increased feed rates at higher steam demand different chemical properties of steam and water different pressures which result from the comparison of the varying water level in the drum with that of a constant head
652 Results of the flue gas analysis indicate a high percentage of carbon dioxide and a low percentage of carbon monoxide, approaching maximum efficiency.  This condition coincides with which area(s) on the graph shown in the illustration? A D B and C E
653 Results of the flue gas analysis indicate a high percentage of carbon monoxide and an extremely low percentage of carbon dioxide.  This condition coincides with which area on the graph shown in the illustration? A B and C D E
654 Routine maintenance of boiler sliding feet should include                     . wire brushing to remove scale, rust, and dirt torquing retaining bolts on the stationary base removing all grease from around the bolts painting the sliding surfaces to prevent corrosion
655 Routine maintenance of boiler sliding feet should include                     . painting the sliding surfaces to prevent corrosion removing all grease from around bolts torquing retaining bolts on the stationary base wire brushing to remove scale, rust, and dirt
656 Rows of tubes installed along the walls, floor, and roof of the furnace are called                     . screen tubes downcomers water walls water headers
657 Safety valve gags should only be installed hand tight in order to prevent                     . compression of the valve spring bending of the valve stem damage to the gag over pressurizing the valve body
658 Safety valves should be set to lift at or below the maximum working pressure allowed by the                     . Marine Power Plant Guide Marine Engineering Regulations Certificate of Inspection Marine Engineer's Manual
659 Saltwater contamination of condensate could occur at which component? DC heater Aftercondenser Fresh water evaporator Intercondenser
660 Scale formation on the waterside of boiler tubes is generally produced by                     . the salts of calcium and magnesium metal oxides in the waterside dissolved oxygen in the waterside accumulations of phosphates in the feed water
661 Scale in the air ejector first-stage nozzle could cause a decrease in the                     . air ejector steam supply pressure low pressure turbine exhaust temperature condensing temperature in the condenser condenser vacuum
662 Scale prevention in boiler water is accomplished by adding treatment chemicals to                     . precipitate scale forming salts into sludge solidify the scale as powder increase boiler water acidity cause the water to be neutral
663 Scavenging air is supplied to steam soot blower elements to                     . prevent back up of combustion gases into soot blower heads provide cooling air when soot blower elements are rotating  through blowing arcs prevent build up of soot on the element prevent overheating of adjacent tubing
664 Scavenging air is supplied to steam soot blower elements to                     . provide cooling air when soot blower elements are rotating  through blowing arcs prevent buildup of soot on the element prevent overheating of adjacent tubing prevent the backup of combustion gases into soot blower heads
665 Scavenging air is supplied to steam soot blowers to                     . prevent the backup of combustion gases into soot blower heads provide cooling air when soot blower elements are rotating  through blowing arcs prevent the escape of steam into the inner casing prevent warping of the cams when exposed to high temperature steam
666 Scavenging air lines are connected to boiler stack periscopes to                     . keep the periscope tubing from warping keep the mirrors from misaligning maintain a negative pressure in the periscope line prevent stack gases from contaminating the periscopes internal components
667 Scavenging air pressure is provided to the steam soot blowers to                     .  I. keep steam from accumulating in the soot blowing element while another element is being operated II. prevent corrosive combustion gases from entering the elements when the system is secured I only II only Both I and II Neither I nor II
668 Sediment in fuel oil will cause                     . sputtering of atomizers panting in the furnace excessive white smoke clogged atomizer tips
669 Sediment in fuel oil will cause                     . wear in the fuel oil pumps clogging of the fuel oil heaters wear in the sprayer plates all of the above
670 Serious tube leaks in the air ejector after condenser assembly may cause                     . clogged steam strainers fouled nozzles an overflow of the contaminated drain inspection tank an overflow of the atmospheric drain tank
671 Serious tube leaks in the air ejector condenser assembly may cause                     . clogged steam strainers high salinity content an overflow of the contaminated drain inspection tank an overflow of the atmospheric drain tank
672 Serious tube leaks in the air ejector condenser assembly will cause                      . clogged steam strainers fouled nozzles loss of vacuum faulty steam pressure
673 Severe priming in a boiler can cause damage to the                     . superheater steam drum internals feed water regulating valve control desuperheater
674 Shortly after shutting off the fuel to a boiler which is to be secured, the                     . air cock should be opened superheater vent may be closed burner registers should be closed feed stop must be closed
675 Should one boiler on a two boiler vessel suffer serious tube damage, the Officer-in-Charge, Marine Inspection may issue a permit (Form CG-948) to proceed to another port for repair                     . only if the vessel's Certificate of Inspection is valid and has not expired as long as no cargo or passengers are being carried only upon written application of the master, owner, or agent of the vessel all of the above
676 Should the superheater outlet thermometer indicate an excessively high temperature on a single furnace boiler, the cause could be                     . dirty steam generating tube surfaces too much excess air the fuel oil being too viscous all of the above
677 Single-element automatic feed water regulators are controlled by the                     . temperature in the steam drum water level in the steam drum pressure in the steam drum feed water flow to steam drum
678 Slag buildup on boiler furnace refractory is undesirable because it causes                     . peeling or spalling of the brickwork excessive cooling of the brickwork shrinking of the brickwork fracturing of the anchor bolts
679 Slag caused by water in the fuel oil will                     . form a protective coating thus increasing its life seal refractory joints thereby improving its function expand at a different rate and result in damaged refractory increase the furnace efficiency because of reduced firebox turbulence
680 Slagging of boiler furnaces is a slow progressive action which is accelerated by                     . fuel oils having high ash content low firing rates prolonged feed water contamination of fuel oil burning diesel fuel
681 Sodium sulfite is added to boiler water to chemically react with any                      . dissolved oxygen present in the water dissolved carbon dioxide present in the water potassium phosphate present in the water phenolphthalein present in the water
682 Sound is produced by the illustrated device by the                     . vertical vibrating movement of "E" high speed rotation of "B" rapid oscillation of "B" rapid input of steam or air through "F"
683 Spray attemperators are commonly used to                     . deaerate condensate reduce steam temperatures cool the intercondenser aerate makeup distillate
684 Stack type air heaters are bypassed when a vessel is in port in order to prevent                     . insufficient air supply to the fires due to the pressure drop across the heater interference with the operation of the soot blowers corrosion of the heater due to the low stack temperatures localized heat stressing of air heater surfaces
685 Steam assist fuel atomizers are converted to straight mechanical atomizers in order to                     . raise steam on the idle boiler cold start a boiler with diesel oil meet minimum boiler steam demands provide the best fuel economy
686 Steam baffles are installed in the steam drum of a  water- tube boiler to                     . direct the flow of steam to the desuperheater inlet reduce the possibilities of carryover prevent water return increase the velocity of the steam and water mixture
687 Steam baffles are used in the steam drum of a water-tube boiler to                     . support the drum safety valve nozzles reduce the possibility of carryover extend the internal feed pipe remove boiler water dirt deposits
688 Steam condensed in the air ejector intercondenser, drains to the                      . atmospheric drain tank aftercondenser drain tank vent condenser drain tank main condenser through the loop seal
689 Steam drains from fuel oil heating coils can be returned to the condensate and feed water system                     . through a direct connection to the heating drain header through a vacuum drag line connection to the fuel heater after being collected in the drain inspection tank after first passing through the DC heater
690 Steam drains from the potable water system hot water heater would be collected in the                     . deaerating feed water heater contaminated drain inspection tank gland exhaust condenser first stage heater
691 Steam drum water level indicators must be calibrated to compensate for density differences between the indicated drum water level, and the actual drum water level.  If no compensation is made, the indicator will show a                     . lower level than exists in the drum with the error becoming greater as the drum pressure decreases lower level than exists in the drum with the error becoming greater as the drum pressure increases higher level than exists in the drum with the error becoming greater as the drum pressure decreases higher level than exists in the drum with the error becoming greater as the drum pressure increases
692 Steam escaping from the boiler casing is a good indication of                      . a leaking tube a leaking water wall header a leaking handhole gasket all of the above are individually correct
693 Steam leaving the desuperheater is used to                     . operate the ship service turbo generator operate auxiliary equipment supply additional steam for propulsion during overload conditions provide steam for propulsion during low speed operation
694 Steam line water hammer can be best prevented by                     . keeping lines drained and insulated replacing all 90Elbows with capped tees always opening steam valves rapidly keeping steam temperature below the saturation point
695 Steam soot blower piping should be thoroughly drained before operating to prevent                     . accidental burner flameout condensate and feed water contamination water hammer damage and nozzle/element erosion overheating the economizer
696 Strainers are installed in boiler fuel oil service lines to                     . absorb contaminants remove solids decrease viscosity adsorb water
697 Strainers are installed in boiler fuel oil service lines to                     . collect water remove solids decrease viscosity absorb contaminants
698 Strainers are installed in boiler fuel oil service lines to                     . absorb contaminants collect water decrease viscosity remove solids
699 Superheated steam is provided to operate the main steam turbine instead of saturated steam due to its                     .  I. higher thermal energy per pound II. lesser erosive action on turbine blading I only II only Both I and II Neither I nor II
700 Superheated steam is provided to operate the main steam turbine instead of saturated steam due to its                     .  I. higher thermal energy per pound II. lesser erosive action on turbine blading I only II only Both I and II Neither I nor II
701 Superheaters of the convection type are heated                     . by direct contact with the flame by hot brick work by gases passing over them from the fuel bed
702 Testing boiler water for chloride content will indicate the amount of                     . total alkalinity in the water phosphates present in the water methyl orange that should be added dissolved salts from sea contamination
703 That portion of the steam drum, containing a manhole for internal access to the drum, for the purpose of cleaning, inspecting, and carrying out repairs, is called the                     . end plate wrapper sheet drumhead tube sheet
704 The ability of the device illustrated to produce sound is greatly affected by the adjustments to "B".  Another factor that can affect the proper operation of this device is the                     . upward movement of "E" steam pressure being maintained at +/- 10% of design changing of the orifice at "I" overall length of "K"
705 The absence of carbon monoxide in the flue gas of a boiler indicates                     . efficient combustion insufficient air contaminated fuel oil low carbon content of fuel
706 The advantage of a counterflow fuel oil heater, as compared to a parallel flow fuel oil heater, is that the counterflow heater                      . produces a higher oil temperature at any given steam temperature has a larger heat transfer area providing greater heat transfer has thinner tube walls providing greater heat transfer is not subject to coking if overheated
707 The advantage of installing water wall tubes in a boiler furnace is to                     . increase the flow of gases through the furnace decrease the flow of gases through the furnace increase heat transfer to the mud drum permit higher combustion rates
708 The amount of fuel oil atomized by a steam atomization burner depends on the atomizing steam pressure, the fuel pressure and the                     . sprayer plate size oil return pressure furnace air pressure windbox pressure
709 The amount of oil atomized by a straight mechanical fuel oil burner depends on the sprayer plate size and the                     . oil return pressure fuel oil pressure forced draft pressure furnace air pressure
710 The amount of sodium phosphate in treated boiler water can be measured by a/an                     . alkalinity test phosphate test chloride test sodium phosphorous test
711 The arc through which a steam soot blower element blows is regulated by the                     . control air pressure direction of element rotation steam supply pressure cam profile
712 The atmospheric drain tank (ADT) normally drains to the               . main and/or auxiliary condenser reserve feed tanks main and/or auxiliary air ejector condenser distillate tank
713 The automatic recirculating valve in the main condensate recirculating line is controlled by a temperature sensor which is located at the                     . air ejector condensate discharge main condensate pump discharge condensate inlet to the main air ejectors main condensate pump suction
714 The automatic recirculating valve in the main condensate recirculating line is designed to be controlled by which method? Thermostatic control Main condenser salt water pressure controller Exhaust steam pressure controller Preset electric timing device
715 The auxiliary exhaust system shown in the illustration can be supplied by steam from the                     . turbo generators IP bleed system LP bleed system distilling plant
716 The best conductor of heat in a marine boiler is                     . steel water steam brick
717 The boiler downcomers shown in the illustration are                     . exposed to the radiant heat of the furnace located away from furnace heat installed directly adjacent to the superheater supported by refractory
718 The boiler economizer provides additional heat to the                     . fuel oil entering the furnace air supply entering the furnace steam leaving the superheater feed water entering the boiler
719 The boiler feed water control valve varies the unity relationship between steam and water flow during periods of                     . minimum boiler load steady boiler load overload operation load change
720 The boiler fuel oil service pump normally takes suction from the                      . fuel oil heater discharge fuel oil settler tank high suction fuel oil settler tank low suction fuel oil storage tanks
721 The boiler fuel oil service pump normally takes suction from the                      . fuel oil heater discharge contaminated drain inspection tank fuel oil settler tank double bottom fuel tanks
722 The boiler fuel oil system 'hot' strainers are also known as                     . coarse strainers magnetic strainers discharge strainers cestus strainers
723 The boiler fuel oil system suction strainers are also known as the                      . 'cold' strainer 'hot' strainer 'fine' strainer magnetic strainer
724 The boiler gage glasses should be periodically blown down to                      . test the feed water stop- check valve provide accurate water samples for the second assistant maintain the proper water level in the steam drum remove any sediment buildup in the gage glass
725 The boiler main feed pump aboard ship can operate with high temperature water without becoming vapor bound because the                     . pump operates at a high discharge pressure constant-pressure governor controls the discharge pressure area above the impeller eye is vented to the main condenser minimum required net positive suction pressure is provided by the DC heater
726 The boiler main feed stop check valve is located nearest the                     . DC heater feed water outlet first stage feed water heater outlet boiler water drum inlet main feed water regulator inlet
727 The boiler screen tubes shown in the illustration connect the                     . upper front header and water drum upper front header and steam drum lower front header and steam drum steam drum and mud drum
728 The boiler shown in the illustration has its screen tubes connecting the steam drum and the component label '        '. I G F D
729 The boiler shown in the illustration, arrow "O" indicates  the                     . main generating tubes superheater tubes screen tubes soot blower elements
730 The boiler superheater shown in the illustration is a/an                     . horizontal U-type overdeck convection- type vertical U-type overdeck integral-type
731 The boiler superheater vent, shown in the illustration, is connected to the part labeled '        '. C M D J
732 The boiler water gage glasses should be blown down                     . when you are in doubt about the water level twice each day on the midnight and afternoon watches every 12 hours of steady boiler steaming operation when the boiler water level changes in a steaming boiler
733 The boiler water level begins to fall very slowly due to the sudden failure of a water wall tube.  In response to this situation, you should continue the feed water supply and immediately                     . reduce the firing rate of the boiler secure the forced draft fans secure the fires and secure the feed water when the level falls out of sight in the gage glass gag the drum safety valves to prevent loss of steam
734 The boiler wrapper sheet, shown in the illustration, is indicated by arrow                     . A B H I
735 The bottom blow valve on a water-tube boiler is usually attached to the                     . steam and water drum boiler mud drum external downcomers floor tubes
736 The bottom blow valve should be used to remove sludge and solids which have settled out of circulation after the boiler                      . is at full load is at low load is secured is being brought up to steaming pressure
737 The BTU value of fuel oil is determined by a/an                     . open cup test calorimeter hydrometer viscosimeter
738 The burner front refractory should be replaced when the slag accumulation causes                     . the burner flame pattern to be distorted slight radial cracking around the burner cones the flame scanners to sense false signals from the glowing  brickwork overheating of the burner atomizer tips
739 The Butterworth heater (tank cleaning heater) shown in the illustration is designed to operate at a nominal steam pressure of approximately                 . 130 psi 240 psi 450 psi 850 psi
740 The Butterworth heater shown in the illustration receives steam at approximately                     . 130 psi 170 psi 205 psi 850 psi
741 The combustion air pressure is increased when using the steam soot blowers to 'blow tubes' in order to                     .  I. aid in the process of removing soot deposits II. prevent the steam from extinguishing the fires I only II only Both I and II Neither I nor II
742 The component labeled "F" as shown in the illustration is                     . one of the retractable soot blower elements a regenerative air heater one of the main burner assemblies a permanently installed Orsat apparatus
743 The component lettered "J" shown in the illustration serves as a                      . water drum support beam side water wall header screen tube header
744 The component shown in the illustration depicts a/an                     . safety valve escape pipe expansion joint spray attemperator with a thermal sleeve internal feed pipe and shell connection dry pipe and shell connection
745 The components lettered "O" shown in the illustration function to                     . clean soot off the surrounding tubes support the surrounding tubes provide viewing of the generating tubes acid clean the surrounding tubes during cold plant maintenance
746 The concentration of total dissolved solids in boiler water could increase as a result of                     . infrequent bottom blows zero water hardness dissolved oxygen deaeration priming and carryover
747 The concentration of total dissolved solids in the boiler water can increase as a result of                     . frequent surface blows dissolved oxygen deaeration zero water hardness insufficient blow down
748 The connection labeled "B" in the illustration is used to                     . maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains provide a point of admission for the L.P. bleed steam drain condensate from the feed water heater to the main condenser
749 The connection labeled "C" in the illustration, is used to                     . maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains provide a point of admission for the L.P. bleed steam drain condensate from the feed water heater to the main condenser
750 The connections labeled "A" in the illustration, are used to                     . maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains provide a point of admission for the L.P. bleed steam drain condensate from the feed water heater to the main condenser
751 The connections labeled "D" in the illustration                     . maintain a vacuum in the shell of the feed water heater provide a point of admission of the steam air heater drains provide a point of admission of the L.P. bleed steam drain condensate from the feed water heater to the main condenser
752 The contaminated drain system normally receives drains that may be exposed to                     . salt water contamination spoiled food contamination oil contamination water contamination due to boiler treatment
753 The contaminated steam system is secured for repairs.  Live steam is supplied to the fuel oil heating system and its returns are directed to the drain tank.  Considering these circumstances, an undetected leak in an idle fuel oil heater could eventually lead to                     . secondary combustion boiler tube failures low stack gas temperatures sputtering burners and possible loss of fires
754 The control desuperheater of most boilers functions to control                     . superheated steam flow desuperheated steam temperature superheater inlet temperature superheated steam temperature
755 The cooling water flow from an air ejector intercondenser and aftercondenser is discharged directly into the                     . main condenser hot well auxiliary condenser hot well condensate and feed system atmospheric drain tank
756 The correct method of expanding a generating tube at the boiler drum tube sheet is to roll                     . to a depth less than the thickness of the drum tube sheet to a depth greater than the thickness of the drum tube sheet heavily at the tube end prior to welding the tube to the drum tube sheet slightly at the tube end prior to welding the tube to the drum tube sheet
757 The DC heater automatic level dump valve is used to                     . divert the flow of condensate from the first stage heater to the vent condenser maintain a proper condensate level in the condenser hot well recirculate condensate to the atmospheric drain tank drain excess feed water to the distilled water tank
758 The DC Heater functions to                     . store, heat, and deaerate feed water chemically treat feed water to remove carbonic gas ensure recirculation in the feed water system remove the major amount of non- condensable gases from the main condenser
759 The DC heater functions to                     . remove air from feed water heat feed water store feed water all of the above
760 The degree of fuel oil atomization is dependent upon the                     . boiler furnace size and shape air pressure at the furnace air supply temperature atomizer design and oil viscosity
761 The depth of fuel oil in a double bottom tank is measured through the                      . vent line depth gage manhole cover sounding tube
762 The designed 'end point for combustion' for a boiler furnace is reached when                     . the amount of heat being transferred to the tubes reaches a maximum no matter how much the firing rate is increased panting of the furnace accompanied with black smoke takes place the maximum rate the boiler can generate steam is reached the boiler is operating at its maximum fuel oil firing rate
763 The development of pinhole leaks where the boiler tubes enter the water drums and headers, may be evidence of                     . gas laning soot corrosion excess alkalinity excess hydrazine
764 The device shown in the illustration is a/an                     . air ejector deaerator desuperheater eductor
765 The difference between the temperature of the condensate discharge and the temperature corresponding to the vacuum being maintained at the exhaust inlet to the main condenser is defined as                     . main circulator loss condensate depression condensate recession absolute condenser temperature
766 The differential temperature of the main condenser circulating water during normal operation will be affected by                     .  I.  Change in circulating pump speed II.  The addition of make up feed I only II only Both I and II Neither I nor II
767 The differential temperature of the main condenser circulating water will be affected by                     .  I.  decrease in circulating pump pressure II.  degree or amount of scaling or fouling I only II only Either I or II Neither I nor II
768 The differential temperature of the main condenser cooling water will be significantly affected by a change in                     . sea temperature condensate pump pressure volume of cooling water flow boiler feed pump pressure
769 The diffuser of a burner register assembly                     . acts as a shield to prevent flare back shapes the fuel particles into a cone serves to make the air mix evenly with the oil adds heat to the fuel particle cone
770 The distance piece in a boiler burner register assembly, provides for adjustment of the                     . diffuser to attain the desired amount of secondary air flow atomizer position to obtain the best mixing of air and oil quantity of the primary and secondary air cones for best air flow total volume of air and fuel admitted through the register
771 The distance piece in a boiler burner register assembly, provides for adjustment of the                     . burner throat opening to attain the desired amount of secondary air flow diffuser position with relation to the atomizer tip fuel oil flame cone angle total volume of air admitted through the register
772 The downcomer tubes installed in modern water tube boilers would normally be located                   . outside of the boiler double casing between the inner and outer boiler casings inside of the boiler inner casing in the furnace gas passages
773 The effects of shrink and swell on boiler water levels can  be minimized by                     . providing a constant surface blow rapidly opening and closing the throttles during maneuvering avoiding rapid opening and closing of the throttles while answering bells installing an automatic single-element feed water regulator
774 The efficiency of boiler combustion can be measured by the relative proportions of certain elements in the flue gases. The elements measured are                     . nitrogen, carbon dioxide, and oxygen nitrogen, carbon monoxide, and oxygen carbon dioxide, oxygen, and carbon monoxide nitrogen, carbon dioxide, and carbon monoxide
775 The 'end point for combustion' for a boiler furnace is reached whenever                     . the amount of heat being transferred to the tubes reaches a maximum no matter how much the firing rate is increased panting of the furnace accompanied with black smoke takes place the maximum rate at which the boiler can generate steam the capacity of the sprayer plates at the designed pressure for the system is attained
776 The end product of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for                     . acid cleaning makeup feed boiler blow down waterside corrosion treatment
777 The end products of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for                     . makeup feed acid cleaning boiler blow down waterside corrosion treatment
778 The entire unit which houses the burner, air scoop, air doors and bladed cone is correctly called the                     . burner assembly register assembly atomizer assembly air duct assembly
779 The feed water heater shown in the illustration is actually comprised of three separately functioning heat exchangers. These heat exchangers are identified as the                     . first stage heater, gland exhaust condenser, and drain cooler first stage heater, inter condenser, and after condenser inter condenser, after condenser, and gland exhaust condenser drain cooler, distillate condenser, and fresh water drain collector
780 The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" (25.4 cm) Hg shell vacuum.  If the shell vacuum is increased to approximately 16" (40.64 cm) Hg vacuum, the                     . overall plant operating efficiency will increase vacuum in the main condenser will drop as the feed heater shell vacuum increases feed water outlet temperature will decrease flow rate of condensate to the feed heater will increase
781 The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" Hg shell vacuum.  If the shell vacuum is decreased to approximately 8" Hg vacuum, the                     . overall plant efficiency will increase vacuum in the main condenser will increase as the feed heater shell vacuum increases flow rate of condensate to the feed heater will decrease feed water outlet temperature will increase
782 The fins on the tubes of a fin type fuel oil heater are provided to                     . clean the fuel oil prevent tube erosion decrease fuel flow increase heater efficiency
783 The fireman/watertender secures the fires because there is no visible water level in the gage glasses of a steaming boiler.  Upon inspection, you observe condensate trickling down the inside of the gage glass.  This indicates                     . high water level low water level priming steam binding of the feed water regulating valve sensing line from the top of the steam drum
784 The firing range of a steam assisted fuel atomizer is regulated to cope with changes in the steam demand by varying the                     . fuel oil return pressure fuel oil supply pressure steam atomization temperature shape of the atomized fuel cone
785 The first and second stage air ejectors used with large sea water cooled steam, surface type condensers are designed to                      .  I.  establish vacuum II.  maintain vacuum I only II only Both I and II Neither I nor II
786 The first and second stage air ejectors used with main steam condensers are designed to                     .  I.  establish vacuum II.  increase condensate temperature I only II only Both I and II Neither I nor II
787 The fittings labeled "P" shown in the illustration are known as the                      . main steam stops main steam outlets desuperheater outlets safety valve nozzles
788 The flash point of a residual fuel oil should be used to determine the                     . highest temperature to which the oil may be heated for atomization minimum temperature to which the oil should be heated for transferring highest temperature to which the oil may be heated in a storage tank minimum temperature to which the oil should be heated in the fuel oil heater
789 The flash point of a residual fuel oil should be used to determine the highest temperature to which the oil may be heated                     . for atomizing for centrifuging in a storage tank in the recirculating line
790 The formation of a pit in a boiler tube is most likely to occur when                      . waterside deposits are present sludge is present dissolved oxygen is present the tube metal acts as a cathode
791 The formation of a pit in the surface of a boiler tube is most likely to occur when                     . waterside deposits are present sludge is present the tube metal acts as an anode dissolved minerals are present
792 The fuel oil has been raised to the proper temperature for the straight mechanical atomization system of the boiler shown in the illustration, and is ready to light off.  Which of the valves listed must be closed just prior to igniting  the fuel? J G A H
793 The fuel oil meter in the fuel oil service system should be bypassed when                     . transferring fuel from storage to settler tank to avoid erroneous fuel consumption readings conducting programmed routine maintenance of the meter while underway warming the oil in the burner headers by recirculation prior to boiler light off finished with engines is given by the bridge
794 The function of a safety valve on a marine boiler is to prevent the pressure in the boiler from rising above                     . design test pressure maximum allowable working pressure the pressure used in the accumulation test the hydrostatic test pressure
795 The function of downcomers installed in water-tube boilers is to                      . accelerate of water circulation decrease the end point for moisture carryover distribute feed water within the drum decrease the rate of steam generation
796 The function of item "E" shown in the illustration is to                     . pulse supply steam or air to chamber "M" allow steam/condensate or air to be evacuated from the unit as sound is produced act as a reed to enable the production of sound control the admission of steam into chamber "L" as part of the process to produce sound
797 The generating tubes in an operating boiler will overheat and possibly fail when the boiler reaches the end point of                     . evaporation generation combustion circulation
798 The gland exhaust fan draws steam and non-condensable vapors from the gland exhaust condenser and discharges to the                      . atmospheric drain tank atmosphere main condenser vent condenser
799 The glass used in a flat-type boiler water gage is protected from the hot steam and water by a/an                     . asbestos gasket mica shield felt cushion copper insulator
800 The greatest deterrent to heat transfer from the fireside to the waterside of a boiler is                     . water film water eddies gas film gas eddies
801 The greatest heat loss in an oil fired boiler is from                     . conduction through tube metals radiation through the furnace casing combustion gases leaving the stack incomplete fuel oil combustion
802 The greatest resistance to heat transfer from the fireside  to the waterside of a water-tube boiler takes place in the                     . steel tube wall itself soot buildup directly on the tube exterior gas film layer surrounding the tube moving water and steam inside the tube
803 The greatest single overall loss of efficiency in a marine propulsion steam plant cycle results from                     . heat lost in the main condenser poor heat transfer in feed water heaters mechanical losses in the atomization process heat loss required for fuel oil heating
804 The guarding valve installed in a boiler bottom blow line prevents                     . loss of steam and water from a steaming boiler due to a leaking bottom blow valve leakage from the blow line back to an idle boiler entry of seawater into idle boilers due to leaking skin and bottom blow valves all of the above
805 The illustrated burner atomizer assembly is                     . straight mechanical used only for variable load steam atomization an example of a rotary cup type atomizer used in a return flow type burner management system
806 The illustrated device is designed as a                     . water and steam separator oil and water separator liquid eductor steam whistle
807 The inability to maintain proper boiler water alkalinity, phosphate, or pH levels in a steam boiler, indicates a leak in the                      . economizer drain line DC heater desuperheater superheater drain line
808 The internal feed pipe in a D-type marine boiler                     . distributes feed water evenly throughout the steam drum guides the feed water toward the downcomer tubes is located well above the normal steam drum water level to  assist in deaeration of feed water is drilled with holes to provide even distribution of boiler feed water chemicals
809 The internal feed pipe in a D-type marine boiler provides             . distribution of feed water evenly throughout the steam drum guidance of the feed water towards the downcomers as it enters the water drum cooling for the internal cyclone separators cooling for the superheater tube bank
810 The internal feed pipe in a D-type marine boiler provides                     .  I. distribution of feed water evenly throughout the water drum II. guidance and distribution of chemicals throughout the steam drum I only II only Both I and II Neither I nor II
811 The internal feed pipe of a power boiler distributes the feed water into the                     . mud drum water drum steam drum economizer
812 The item labeled "C" in the illustration, is the                     . low pressure drain connection high pressure drain connection low pressure vent connection low pressure steam supply connection
813 The items labeled "A" in the illustration are the                     . low pressure drain connections high pressure drain connections low pressure vent connections low pressure steam supply connections
814 The items labeled "C" and "L" as indicated on the illustration are commonly called                 . mica sheets face plates cork gaskets glass plate inserts
815 The items labeled "D" and "M" as indicated on the illustration are commonly called                 . mica sheets face plates cork gaskets glass inserts
816 The items labeled "D" in the illustration are the                     . low pressure drain connections high pressure drain connections low pressure vent connections low pressure steam supply connections
817 The last two digits stamped on a fuel oil atomizer sprayer plate represents the cross-sectional area ratios of the tangential slots and orifice.  This ratio determines the                     . density of the oil spray degree of atomization angle of the cone capacity of the atomizer
818 The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by                     . special packing in the stuffing box a water seal line to the packing gland an air seal line from the compressed air line the vacuum in the pump suction
819 The level in the atmospheric drain tank is normally maintained by the use of a/an                     . overflow to the bilges float-type regulator vacuum drag to the air ejector condenser overflow to a distillate tank
820 The level in the atmospheric drain tank when underway at sea, is normally maintained by the use of a/an                     . overflow to the bilge drain tank float-type regulator draining to the main condenser vacuum drag to the air ejector condenser overflow to a distillate tank
821 The life of the furnace lining can be affected by                     . the quality of installation the service environment the proper application of inspection criteria all of the above
822 The limiting factor in determining the end point for combustion is usually the                     . shape of the burner size of only the sprayer plates fuel oil pressure as the only concern ability of the forced draft fan to supply combustion air
823 The loop seal connected to the main condenser returns the drains from the                     . vent condenser intercondenser aftercondenser all of the above
824 The lower section of the feed heater, labeled "E" in the illustration is used as the                     . drain cooler gland exhaust condenser after condenser first stage heater
825 The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine.  The admission of steam is normally regulated by a                     . flyweight controlled regulating valve multi nozzle arrangement constant speed limiting governor constant pump discharge pressure governor
826 The main condensate pump in a steam propulsion plant discharges directly to the                     . air ejector intercondenser main condenser hot well air ejector aftercondenser DC heater vent condenser
827 The main condenser is losing 2" Hg vacuum every 5 minutes.  In an hour, the absolute pressure will have increased by approximately                     . 6 psia 12 psia 16 psia 24 psia
828 The main feed check valve functions to                     . check pressure pulsations in the feed line prevent backflow of water from the boiler in the event of a feed pump failure provide feed pump positive discharge head reduce feed pump discharge pressure loading
829 The main function of a desuperheater is to                     . maintain uniform steam flow through the superheater while providing auxiliary steam as required heat the water in the drum while maintaining sufficient flow through the generating tubes provide the boiler with additional steam generating surface while providing a sufficient reservoir for surface blow heat the water in the drum while providing additional steam generating surface in the boiler
830 The main purpose of the boiler steam drum component shown in the illustration is to                     . permit expansion during pressure surges prevent thermal shock reduce vibration reduce the possibility of priming
831 The main reason for having a low suction line on the fuel oil service or settling tanks is to                     . prevent loss of suction during rough weather decrease suction head on the pump increase the amount of fuel available for use facilitate water removal
832 The main reason for keeping an operating boiler burner register fully open while steaming is to prevent                     . boiler explosions the fires being blown out boiler register warping improper fuel/air mixture
833 The main steam stop bypass valve is used to                     . isolate the main steam stop for repairs while steaming gradually increase the pressure and temperature of the main steam piping when warming up cross-connect two steaming boilers supply auxiliary steam when the main steam stop is closed
834 The main steam stop valve on a "D" type marine boiler is located at the                     . desuperheater outlet desuperheater inlet superheater outlet superheater inlet
835 The major heat loss in a marine boiler is from the heat                     . used in the economizer and air heater passing through the boiler casing of combustion gases leaving the stack required to change water into steam
836 The major heat loss in an oil fired boiler is the heat                     . used in the economizer and air heater passing through the boiler casing going up the stack required to change water into steam
837 The major reason dissolved gases are removed from boiler feed water is because they may cause                     . condenser vacuum loss corrosive conditions in the boiler a false boiler water level vapor lock in the feed pumps
838 The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be               . 825 psi 850 psi 875 psi 900 psi
839 The maximum allowable working pressure of a particular boiler is 1050 psig (7340 kPa).  The hydrostatic test pressure to be used during the Coast Guard required quadrennial inspection will be                     . 1050 psig (7340 kPa) 1312 psig (9146 kPa) 1575 psig (10959 kPa) 1850 psig (12855 kPa)
840 The means of circulation commonly found in water-tube boilers is                     . compound accelerated natural cross-compound integral
841 The measured gap between the face of the burner atomizer tip nut and the diffuser plate, is determined by the setting of the                      . atomizer tip nut distance piece sprayer plate diffuser plate
842 The mid section of the feed heater, indicated by "F" in the illustration is used as the                     . drain cooler gland exhaust condenser after condenser first stage heater
843 The minimum design height of the DC heater is determined by the                . dew point temperature of the stack gases minimum net positive suction head required by the main feed pump maximum condensate pump discharge pressure desuperheater outlet temperature
844 The minimum feed water inlet temperature to a boiler economizer is determined by the                     . dew point temperature of the stack gas superheater outlet temperature surface area of the third stage heater radiant heat transfer in the furnace
845 The minimum temperature requirements for fuel oil in storage tanks is related to the                   . fire point of the oil pumpability of the oil size of the containment area in case of overflow size of the vents
846 The most common cause of abnormal fireside burning of the boiler superheater tubes can "indirectly" be the result of                   . combustion gases impinging on the tubes fuel droplets striking the hot tubes excessive boiler water carryover the tubes being subjected to excessive vibration
847 The MOST common cause of heat blisters developing on boiler generating tubes is due to                     . waterside deposits flame impingement gas laning insufficient water circulation
848 The most effective way to eliminate sludge from the water drum of a boiler is to                     . frequently use the surface blow chemically treat the boiler water wash the boiler watersides give the boiler a bottom blow
849 The most harmful slag forming compounds found in fuel oils are                      . iron and sulphur vanadium and sodium potassium and nickel calcium and silica
850 The most important consideration to take into account when water washing the firesides of a water tube boiler is                 . the corrosive effects of sulfuric acid the rusting of boiler tubes possible damage to the outer casing possible damage to the smoke periscope
851 The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to                     . visually inspect the bearing check the lube oil temperature check the lube oil viscosity perform a carbon blot test on an oil sample from the bearing
852 The most serious fireside burning of the boiler superheater tubes can be INDIRECTLY attributed to                     . combustion gases impinging on the tubes fuel droplets striking the hot tubes excessive boiler water carryover the tubes being subjected to excessive vibration
853 The most serious fireside burning of the boiler superheater tubes is the result of                     . combustion gases impinging on the tubes fuel droplets striking the hot tubes carbon steel tubes being heated above 750F the tubes becoming steam bound or dry
854 The most troublesome corrosive substances in boiler water are oxygen and                     . hydrogen sulfide sulfur dioxide carbon dioxide ammonia
855 The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the                     . feed water vapor pressure speed of the impeller pump capacity in gpm impeller ratio of the pump
856 The net positive suction head of a boiler centrifugal feed pump should be calculated to include the feed water vapor pressure and the                     . impeller ratio of the pump speed of the impeller pump capacity in gpm height of the DC heater
857 The number '29' on a fuel oil burner sprayer plate marked '2909' indicates  the                     . orifice size cross-sectional area ratio whirling chamber size slot cross-sectional area
858 The overheating of fuel oil in the fuel oil heaters may result in                      . excessive atomization clogged fuel oil heaters ineffective straining of the fuel oil low fuel oil service pump discharge pressure
859 The peeling of boiler refractory associated with slagging,  is caused by the                     . shrinkage of brickwork adjacent to slag coated refractory chemical action of the slag on the firebrick surface difference in the rate of expansion between the firebrick and slag coating uneven heating of the brickwork during boiler warm up
860 The percentage by weight of steam in a mixture of steam and water is called the                     . moisture percentage moisture quality quality of steam heat effectiveness
861 The phenomenon called 'shrink' causes an apparent drop in the water level of a steaming boiler.  This phenomenon is caused by a/an                     . collapse of steam bubbles excessive formation of steam bubbles sudden decrease in steam pressure rapid increase in feed rate
862 The photoelectric cell installed as part of the combustion safety controls of an automatically fired boiler will                     . sense light from the burner flame control the modulating pressure control circuit open the control circuit upon sensing an intense flame close the control circuit upon sensing a flame failure
863 The phrase 'boiler water column' as defined in the regulations, refers to the                     . water level indicator vertical water leg pressure head to the feed water pump suction pressure gauge reading in feet of water
864 The plugging of an excessive number of superheater tubes will result in                     . high superheater outlet temperature low superheater outlet temperature high boiler water level low superheater outlet pressure
865 The plugging of an excessive number of superheater tubes will result in                     . high superheater outlet temperature low superheater outlet temperature high boiler water level lower stack temperatures
866 The popping pressure of the safety valve, shown in the illustration, is controlled by the                     . seat bushing adjustment feather guide retaining ring adjusting ring position amount of spring compression
867 The possibility of a flareback in a boiler will be reduced  if you                      . rotate the soot blower elements one complete revolution prior to lighting off maintain the fuel oil to the burner at the flash point supply a minimum of excess air purge the furnace with fresh air prior to lighting off
868 The presence of sulphur in fuel oil will most likely cause                     . a decrease in the ability of the oil to be properly atomized an excessive heat content per unit volume heavy slag formation on the refractory corrosion on the firesides of the boiler
869 The pressure in the feed water system must exceed boiler steam drum pressure in order to                     . prevent water hammer in the lines prevent air leakage into the feed water system force the feed water into the boiler remove the steam from the steam drum
870 The primary difference between sludge and scale deposits in boiler tubes is                     . scale forms only on the cooler boiler tubes whereas sludge  forms on all tubes scale forms as the result of the crystallization of salts, whereas sludge may consist of reaction products from boiler treatment sludge is hard and non- adherent at operating temperatures, whereas scale can be deposited at any boiler temperature range scale is heavier than water and forms in lower drums and headers, whereas sludge is more likely to form along the steam drum waterline
871 The primary function of the contaminated drain inspection tank is to                     . provide a source of make-up feed provide a means to preheat auxiliary condensate provide a means to cool down contaminated drains serve as a means for visually examining steam condensate drains which may contain oil
872 The primary objective of the auxiliary exhaust system is to supply steam to the                     . main condenser main feed pumps deaerating feed tank soot blowers
873 The primary operational difference between a huddling chamber type safety valve and a nozzle reaction type safety valve is the                     . manner in which steam pressure causes initial valve opening principle by which blow down is accomplished difference in valve relieving capacities manner in which lifting pressure is adjusted
874 The primary purpose of a control desuperheater installed in the steam drum of a boiler is to                     . assure a constant volume of steam flow through the entire superheater under all load conditions regulate the temperature of superheated steam by adding moisture regulate the superheater outlet temperature by cooling a portion of the superheated steam regulate saturated steam temperature through the desuperheater
875 The primary purpose of insulating cement is                     . to seal joints in brickwork to anchor insulating block to the casing to cushion the pieces against concentrated stresses to fill voids in the insulation block layers at missing corners or at cutouts for anchor devices
876 The primary purpose of refractory mortar is                     . to seal brickwork joints to seal tile installation joints to provide cushioning of individual pieces against concentrated stresses all of the above
877 The primary purpose of screen tubes installed in a marine boiler is to                     . act as internal downcomers protect the furnace casing and retain furnace heat protect the generating tube bank from the convectional heat transfer protect the superheater from radiation heat transfer
878 The primary purpose of the boiler internal dry pipe is to                     . prevent priming and foaming in the boiler drum remove all moisture from steam leaving the boiler permit a flow of nearly dry saturated steam prevent foreign materials from entering the steam drum
879 The primary purpose of the heater used in a pressurized fuel oil system is to                     . reduce fuel oil viscosity for proper atomization reduce fuel oil specific gravity for better combustion increase the fire point of the fuel oil improve the flash point of the fuel oil
880 The primary purpose of the refractory in a marine boiler is to                     . conduct the heat of combustion away from the water wall tubes protect the furnace casing and retain furnace heat support the outer casing protect the superheater from convectional heat transfer
881 The primary purpose of the sprayer plate in a mechanical atomizing oil burner is to                     . completely mix air with the fuel assist in mixing atomizing steam with the fuel produce a fine, swirling, uniform fuel mist prevent primary air mixing with the fuel
882 The primary source of steam to the auxiliary exhaust system is typically supplied directly from                     . the main engine LP bleed turbine driven and reciprocating steam pumps the turbine gland exhaust system all of the above
883 The principal means of increasing the amount of blow down for safety valve shown in the illustration, remove the set screw labeled                     . "A" and raise the position of the ring "A" and lower the position of the ring "B" and raise the position of the ring "B" and lower the position of the ring
884 The process of breaking up fuel oil into fine particles to ensure good combustion is called                     . settling straining pumping atomization
885 The proper way to quickly reduce high water level in a steaming boiler is to use the                     . bottom blow valve safety valve water column valve surface blow valve
886 The property of a fuel oil which is a measurement of its available energy, is known as its                     . cetane number heating value viscosity index cetane index
887 The proportion of downcomers installed in relation to riser tubes in a vertical tube type of boiler, is dependent upon  the                     . degree of superheat type of water level control steam output of the boiler position of the mud drum
888 The purpose of a contaminated steam system is to                     . distill water from a harbor ensure fouled heating coil returns from fuel tanks do not contaminate boiler feed water distill makeup feed for use as potable water ensure an uncontaminated source of feed for the makeup evaporator
889 The purpose of a 'peep' hole in the boiler casing is to                     . examine the condition of the flame check the operation of the soot blowers check for excess smoke in the stack examine the condition of the refractory cones
890 The purpose of boiler tube curvature shown in the illustration in the area labeled "L" is to                     . accommodate an oil burner for separately firing the superheater compensate for the greater degree of expansion in the superheater area accommodate an inspection port used to view superheater conditions while steaming allow for access to the superheater cavity
891 The purpose of firebrick in a water tube boiler furnace is to                     .  I. protect the generating tubes from flame impingement II. protect the boiler furnace inner casing I only II only Both I and II Neither I nor II
892 The purpose of the air chamber at the discharge side of a steam reciprocating boiler feed pump is to                     . facilitate draining of the cylinder reduce pulsations in the feed line adjust the speed of the pump provide for the addition of boiler compound
893 The purpose of the boiler bottom blow valve is to                     . remove scum from the steam drum during steaming control steam drum water level in an emergency remove heavy solids from the water drum all of the above
894 The purpose of the boiler drum air cock is to                     . admit air when the boiler is being emptied permit escape of air when the boiler is being filled permit escape of air when steam is forming in the drum after lighting off all of the above
895 The purpose of the boiler furnace corbel is to                     .  I. protect the water drum from direct flame impingement II. support the furnace wall I only II only Both I and II Neither I nor II
896 The purpose of the cam-actuated steam valve used in a boiler soot blower system, is to                     . rotate the element through a predetermined blowing arc automatically blow the elements in the proper sequence automatically secure steam to the blower head any time the element stops turning prevent steam from entering the soot blower when the element holes are directed toward the refractory
897 The purpose of the diffuser in a boiler burner assembly is  to                     . break up fuel oil into a fine spray assist combustion by heating incoming air shield the flame from the incoming air blast while allowing some mixing of fuel and air diffuse flame to all corners of the furnace
898 The purpose of the division plates installed in boiler superheater headers is to                     . limit the maximum temperature rise of the superheater outlet to 15F ensure proper steam flow, thus preventing 'short circuiting' of superheater loops provide a means of controlling steam passage in response to throttle demands all of the above
899 The purpose of the mica used in a boiler water gage glass assembly is to prevent                     . overheating of the glass light refraction in the glass etching of the glass leakage from the glass
900 The purpose of the pressure control disk installed in the soot blower illustrated is to                     . control the velocity and distance of the steam valve passing from the soot blower element reduce the steam supply pressure to the soot blower element control the amount of arc during rotation of the soot blower element assist in the initial opening of the valve at the beginning of the soot blower operation
901 The purpose of the pressure control disk installed in the multi-nozzle soot blower, as shown in the illustration, is to                     . control the pressure exerted on the steam valve disk when the cam secures the steam supply reduce the steam supply pressure to the soot blower element control the pressure exerted on the valve spring retainer increase the pressure in the steam supply line for proper soot blower operation
902 The purpose of the recirculating line between the turbine driven feed pump and the DC heater is to                     . ensure a steady boiler water level at all loads seal the labyrinth packing on the pump ensure sufficient flow through the feed pump at low load cool the vent condenser
903 The purpose of the refractory lining of a water-tube boiler furnace is to                     . prevent flames from impinging on tubes assist in maintaining the heat of combustion within the furnace support the outer casing protect the superheater from convectional heat transfer
904 The purpose of the relief valve in a fuel oil service system is to                      . protect the service pump from high discharge pressure regulate the atomizer oil pressure control the oil pressure regulators supply constant pressure to the burner combustion control valves
905 The purpose of the relief valve in a fuel oil service system is to                      . protect the system from high discharge pressure regulate the atomizer oil pressure control the oil pressure regulators supply constant pressure to the burner combustion control valves
906 The purpose of the steam control valves installed in the auxiliary exhaust line is to                     . control steam admission and maintain the proper steam spray pattern in the DC heater regulate back pressure in the desuperheater line preheat the condensate before it enters the vent condenser seal the vent condenser to prevent the escape of condensate
907 The rate of fouling on the oil side of a fuel oil heater is inversely related to the                     . quality of steam flowing through the heater flow rate of fuel oil through the heater shape of the heating coils in the heater pressure on the oil in the heater
908 The rate of fouling on the oil side of fuel oil heaters is directly related to the                     . steam pressure in the heater shape of the heating coils in the heater oil pressure in the heater rate of oil flow through the heater
909 The rate of fouling on the oil side of fuel oil heaters is  mostly affected by the                     . quality of the steam flow through the heater shape of the heating coils in the heater pressure on the oil in the heater rate of oil flow through the heater
910 The recirculating valve provided in a straight mechanical boiler fuel oil service system, should be opened when                     . going into maneuvering conditions the service pump relief valve lifts bypassing one bank of fuel oil heaters preparing to light off a cold boiler
911 The recommended vacuum should be maintained in the main condenser to                     . condense turbine exhaust steam recover latent heat from turbine exhaust steam recover sensible heat from turbine exhaust steam utilize the greatest possible amount of energy
912 The relief valve on the discharge side of the fuel oil service pump may discharge directly to the settler, or to the                     . fuel oil heater inlet suction side of the pump oil header return line double bottom fuel tank
913 The relief valve on the discharge side of the fuel oil service pump may discharge directly to the suction side of  the pump, or to the                     . fuel oil heater inlet oil header return line double bottom fuel tank fuel oil settling tank
914 The relieving capacity of the superheater safety valves is considered to be insufficient when the working pressure of the boilers is                     .  I. increased II. Decreased I only II only Both I and II Neither I nor II
915 The relieving pressure of the superheater safety valves is permitted to be reset without exchanging the valves when the working pressure of the boilers is                     .  I. increased II. Decreased I only II only Both I and II Neither I nor II
916 The required number of pounds of steam generated per hour to develop contract shaft horsepower and maintain the specified pressures and temperatures in the plant, when divided by the number of installed boilers, will give the                     . overload capacity for each boiler efficiency of each boiler efficiency of each fire room full power capacity of each boiler
917 The results of a flue gas analysis indicate a very high percentage of oxygen, and a low percentage of carbon dioxide.  This condition coincides with which area on the graph shown in the illustration? A B and C D E
918 The safety valve hand lifting gear should not be used if the boiler pressure is less than 75% of the safety valve popping pressure in order to                     .  I. provide sufficient steam flow across the valve to prevent the collection of scale on the seat II. prevent cracking of the seat due to chattering of the feather and disc I only II only Both I and II Neither I nor II
919 The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches.  The term 'nominal size' refers to the                     . free spring length diameter of the feather diameter of the inlet opening diameter of the huddling chamber
920 The scavenging air for soot blowers is supplied by the                     . low pressure air compressor forced draft blowers control air regulator all of the above
921 The screen tubes shown in the illustration are indicated by arrow '         .' F J H D
922 The set point pressure at which the first boiler safety valve is to lift is the                     . maximum steam drum pressure boiler overload capacity operating design pressure boiler full-power capacity
923 The steam drum air cock is normally opened when cooling down a boiler to                     . relieve any residual air pressure in the drum prevent a vacuum forming in the steam drum reduce the pressure in the drum more rapidly protect the superheater
924 The steam drum in a D-type marine boiler                     . maintains circulation by forcing steam bubbles downward in  the generating tubes supports the superheater tube bank provides a space for moisture to separate from the steam acts as a receptacle for heavy suspended solids in boiler feed water
925 The steam drum installed in "D" type boilers serve to provide                     .  I. a water reserve necessary for proper boiler  operation II. an area for steam and moisture to separate I only II only Both I and II Neither I nor II
926 The steam generating capacity of a boiler depends upon the                     . number of burners relative size of tubes and downcomers amount of heat absorbing surface all of the above
927 The steam separator as used in conjunction with a steam whistle normally drains to which of the listed drain systems? Low pressure High pressure Main turbine Contaminated
928 The steam soot blower piping should be thoroughly drained before operating to prevent                     . impinging of generating tube surfaces feed water losses plugging of nozzles warping of soot blower elements
929 The steam soot blower piping should be thoroughly drained before operating to prevent                     . accidental flameout feed water losses nozzle/elements eroding erosion of the corbel
930 The steam soot blower piping should be thoroughly drained before operating to prevent                     . accidental flameout feed water losses nozzle plugging erosion of refractory
931 The superheater vents should always be open when                     . blowing down the boiler blowing tubes lighting off the boiler the water level is lower than normal
932 The temperature of steam at the superheater outlet is influenced by the                     . temperature of the feed water amount of excess air amount of moisture contained in the steam all of the above
933 The temperature of the fuel oil received during bunkering operations is critical in determining the                     . expansion space to leave in a tank flash point at which the fuel will burn temperature to which the fuel must be heated rate at which the fuel can be pumped during transfer operations
934 The term 'shrink' relates to a change in boiler water level which                      . results when the feed rate becomes erratic during maneuvering is due to the steam bubbles below the surface occupying a smaller volume results in a rapid change of steam temperature indicates a high chloride concentration in the boiler water
935 The term 'swell' relates to a change in boiler water level which                      . results when the feed rate becomes erratic during maneuvering is due to the steam bubbles below the surface occupying a larger volume is due to a rapid change of steam temperature during maneuvering operations indicates a high chloride concentration in the boiler water
936 The terms 'swell' and 'shrink' relate to a change in boiler water level which                     . results when the feed rate becomes erratic during maneuvering is due to the volumetric change in the size of the steam bubbles below the water surface result in a rapid change in fuel oil viscosity indicates a high chloride concentration in the boiler water
937 The terms 'swell' and 'shrink' relate to a change in boiler water level which                     . results when the feed rate becomes erratic during maneuvering is due to steam bubbles below the surface occupying a smaller volume results from a change in steam flow or firing rate indicates a high chloride concentration in the boiler water
938 The time taken to raise steam on a cold boiler should always be                      . the time specified by the boiler manufacturer not less than a full 24 hour not more than 1 full hour as short as possible to avoid over expansion
939 The total heating surface of any steam generating unit is comprised of which of the listed surfaces? Those parts of a boiler which are exposed on one side to only the water being heated and on the other side to the combustion gases, such as the economizer surfaces. Those parts of a boiler which are exposed on one side to only the steam being heated and on the other side to the combustion gases, such as the superheater surfaces. Those parts of a boiler which are exposed on one side to the water or steam being heated, and on the other side to the combustion gases. Those parts of a boiler which are exposed on one side to only the water being heated and on the other side being directly exposed to the furnace flame.
940 The tube sheet shown in the illustration is indicated by the letter '         '. A B I K
941 The tubes projecting horizontally through the generating tube bank shown in the illustration are                     . through stays generator support tubes soot blower elements steam smothering lines
942 The turbo generator steam stop is located between the superheater outlet and the main steam stop valve to                     . provide for easier access provide higher quality steam for the turbo generators provide a flow of cooling steam through the control desuperheater allow the use of superheated steam in the turbo generator without pressurizing the larger main steam line
943 The turndown ratio an automatic combustion control system is the ratio                     . of air to fuel for a given firing rate of forced draft fan speed to feed water flow between the highest and lowest oil pressure at which the burner will remain lit between fuel oil pressure and atomizing steam pressure at a given firing rate
944 The two common chemicals which are the primary cause of internal boiler corrosion are               . carbon monoxide and sodium sulfite dissolved oxygen and hydroxyl ions phosphates and chromates chromates and hydrazines
945 The two most common causes of boiler corrosion attributable to boiler water are dissolved oxygen and                     . carbon monoxide hydroxyl ions ammonia nitrogen
946 The two-element feed water regulator functions similarly to the three-element feed water regulator, but does not utilize                     . steam flow measurement feed water flow measurement water level drum pressure
947 The unit shown in the illustration is used as the                     . high pressure feed heater combined low pressure feed heater butterworth feed heater flash evaporator salt water feed heater
948 The upper section of the feed water heater indicated by "G" in the illustration is used as the                     . drain cooler gland exhaust condenser after condenser first stage heater
949 The useful life of furnace refractory is affected most by                     . the quality of the fuel being burned improper treatment of boiler water high steady steaming boiler loads large and rapid changes in furnace temperature
950 The vacuum drag line for the main condenser is specifically connected in which area? main tube bank the steams first point of entry the end of the steam lane lower portion of the hot well
951 The valve located between the fuel oil header and the burner valve is known as the                     . root valve return valve header valve register valve
952 The variable capacity pressure atomizing fuel oil burner functions to                     . maintain a constant fuel temperature provide a wide range of combustion provide a constant fuel return pressure maintain smokeless fuel oil atomization
953 The vent line from the main condenser water boxes was not opened when the waterside was recharged. This would                     .  I.  lead to vapor binding of the main circulating  pump II.  contribute to a higher than normal condensate temperature entering the air ejector condenser I only II only Both I and II Neither I nor II
954 The vent line from the main condenser water boxes was not opened when the waterside was recharged. This would                     .  I.  lead to a build up of pressure on the tube sheet  of greater than 40 psig. II.  prevent the design vacuum from being attained under normal operating conditions at sea I only II only Both I and II Neither I nor II
955 The viscosity of a residual fuel oil is measured in Saybolt                     . Milliliters Universal Millimeters Universal Seconds Furol Minutes Universal
956 The water level in a steaming boiler has risen to within 2 inches of the top of the top gage glass.  Your immediate action should be to                     . secure the fires and open the bottom blow valve reduce the feed water flow to the boiler secure the feed water flow to the boiler open the surface blow line
957 Thin sheets of mica are installed in boiler gage glasses to                     . reduce the possibility of the glass from becoming etched limit the possibility of glass being blown out into the fire room lower the conductivity of the water in the glass prevent gasket leakage
958 Thin sheets of mica are installed in boiler gage glasses to                     .  I. reduce the effects of thermal exposure on the glass II. enhance the ability of the operator to observe the water level from a distance I only II only Both I and II Neither I nor II
959 Throttling the burner air register of a lit burner could result in                     . carbon deposits on the register doors carbon deposits on the furnace walls too much excess air for combustion excess combustion temperature in the furnace
960 To adjust the amount of safety valve blow down, as shown in the illustration, you would reposition the part indicated by arrow '               .' A B C D
961 To allow for water drum expansion and contraction, most main propulsion boilers are fitted with                     . U-bend tubes expansion joints sliding feet spring supported pipe hangers
962 To assure a long service life for boiler refractory materials after installation, the most effective method is  to                     . maintain a high furnace temperature at all times patch refractory with plastic chrome ore properly secure refractory with anchor bolts avoid rapid temperature changes and follow recommended operating procedures
963 To avoid acid corrosion of the economizer tubes when blowing tubes                     . raise boiler pressure lower boiler pressure lower water level drain the soot blowers headers
964 To change the amount of blow down of the safety valve shown in the illustration, you must change the position of the                     . feather guide adjusting ring compression screw huddling chamber
965 To change the lifting pressure of the safety valve shown in the illustration, you must readjust the part labeled                     . A B C D
966 To combat galvanic corrosion, condensers utilizing  copper- nickel waterboxes are usually fitted with                     . bonding straps zinc anodes protective coatings all of the above
967 To combat galvanic corrosion, condensers utilizing  copper- nickel waterboxes are usually fitted with                     . bonding straps iron or steel anodes protective coatings all of the above
968 To comply with Coast Guard Regulations (46 CFR), which type of boiler listed shall be subjected to a hydrostatic test at one and one half times maximum allowable working pressure? All water-tube boilers once a year. All water-tube boilers once every 4 years. All water-tube boilers to which extensive repairs have been made. All fire-tube boilers once every 2 years.
969 To increase the blow down of a nozzle reaction safety valve,                     . lower the nozzle ring raise the blow down ring lower the adjusting ring raise the blow down ring and then lower the nozzle ring
970 To increase the popping pressure of the safety valve shown in the illustration,                     . raise the adjusting ring lower the adjusting ring loosen the compression screw tighten the compression screw
971 To make temporary emergency repairs to brickwork in a boiler furnace, which of the materials listed should be used? Plastic refractory Air setting mortar Insulating block Calcined diatomaceous earth
972 To minimize metal corrosion, boiler water is best kept                     . fairly acidic slightly acidic neutral alkaline
973 To obtain the best mixing of air and fuel with a fuel oil atomizer, you need to adjust the                     . atomizer position using the distance piece diffuser to the desired flow primary and secondary air cones for desired air flow total air volume admitted to the boiler furnace
974 To prevent a small plastic refractory wall patch repair from falling into the furnace of a D-type boiler, you should                     . attach anchor bolts to the furnace casing reinforce the patch with fine mesh metal screen mix the plastic with concrete prior to using undercut the existing brick around the area to be patched
975 To prevent pulsations from developing in the boiler feed water lines, the discharge side of a reciprocating feed pump is equipped with a/an                     . feed water regulator air chamber relief valve reed valve
976 To prevent safety valves from lifting when a boiler is being hydrostatically tested, you should                     . tie down the hand lifting gear increase the valve spring pressure decrease the valve spring pressure install gags on the valves
977 To properly blow down a boiler gage glass, you should                     . blow through the top (steam) connection first blow through the bottom (water) connection first never disconnect the chains that connect the upper and lower cut out valves take up snugly on upper and lower gage glass packing nuts prior to blowing down
978 To properly clean a burner tip, you should use                     . light sand blast grit a soft metal tool a jack knife a wire brush
979 To properly remove the burner tip nut from the burner barrel, the barrel should be                     . clamped in a machinist's vice on the work bench fixed in the burner stowage rack held by the fixture on the burner cleaning bench removed from the gooseneck before removing the tip nut
980 To provide emergency feed water supply to a steaming boiler and it becomes necessary to secure the DC heater, suction should be taken on the distilled water tank using the                     . emergency injector discharge emergency feed pump feed booster pump main condensate pump
981 To safely decrease the boiler firing rate, you should always reduce the fuel pressure                     . after reducing the forced draft pressure before reducing the forced draft pressure by opening the oil recirculating valve by opening the fuel pump relief valve
982 To safely increase the firing rate of a boiler, you should always increase the forced draft pressure                     . before increasing the fuel pressure after increasing the fuel pressure by opening the burner register wider by opening additional burner registers
983 To safely reduce a high water level in a steaming boiler, you should                     . use the bottom blow use the surface blow secure the boiler fires open the superheater drain
984 Too much excess air in a steaming boiler may be indicated by                      . a white burner flame a clear stack white smoke all of the above
985 Treatment of boiler feed water for the control of hardness is necessary to prevent                     . excessive feed water alkalinity foaming carryover waterside scale deposits
986 Tubes may be seal welded into fittings or headers of boilers and superheaters after they have been expanded and flared, provided the material in the fitting or header does not contain carbon in excess of                     . 0.35% 0.40% 0.45% 0.50%
987 Two-element feed water regulators operate by sensing                     . boiler water level and steam flow boiler water level and steam pressure boiler water level and feed water flow feed water flow and steam pressure
988 Ultraviolet light sensing flame scanners installed on an automated main propulsion boiler, are designed so they                     . might be misled by glowing brickwork will be sensitive to the outer portion of flames are sensitive only to the center of the ultraviolet portion of the flame from a particular burner cannot be used with steam atomizing burners
989 Under constant boiler load, the superheated steam temperature may rise above normal for the existing load if                     . excess air is too low feed water temperature is too low boiler water level is too high combustion air is excessively hot
990 Under EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the                      . auxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow auxiliary stop and stop- check valves fully open and the feed pump speed used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feed water regulator
991 Under normal conditions, steam to the DC heater is supplied directly from which of the systems listed? Main steam 600 psi auxiliary steam 150 psi auxiliary steam Auxiliary exhaust steam
992 Under normal conditions, the rate of heat transfer in a feed water heater is most greatly affected by the                     . temperature differential between the steam and feed water density of the feed water pH of the feed water speed of the main feed pump
993 Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by                     . high feed water temperature too much excess air dirty generating tubes fouled economizer tubes
994 Under normal firing rates, which of the conditions listed could result in a low superheater outlet temperature? High feed water temperature Too much excess air Dirty generating tubes Fouled economizer tubes
995 Under normal operating conditions of constant load and combustion rates, which of the following will occur when the amount of excess air to the furnace is increased? The superheater inlet temperature will decrease. The rate of heat transfer will decrease. The superheater inlet temperature will increase. The superheater outlet temperature will increase.
996 Under normal operating conditions, a drop in the steam temperature at the outlet of an interdeck superheater could be caused by a decrease in                     . steam velocity through the superheater the feed water temperature combustion gas velocity through the superheater the pressure differential across the fuel oil strainers
997 Under normal operating conditions, a drop in the steam temperature leaving an interdeck-type superheater can be caused by a decrease in the velocity of the                     . combustion gas flowing around the superheater tubes steam flowing through the superheater tubes steam flowing through the desuperheater steam entering the dry pipe
998 Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a                     . decrease in combustion gas velocity through the superheater decrease in steam velocity through the superheater drop in the feed water temperature badly fouled economizer
999 Under otherwise normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck-type superheater could be caused by a/an                     . increase in combustion gas velocity through the superheater decrease in steam velocity through the superheater increase in feed water temperature badly fouled economizer
1000 Under otherwise normal steaming conditions, an abnormally high temperature at the superheater outlet of a single furnace boiler would indicate                     . poor heat transfer in feed water heaters high steam demand insufficient combustion air excessive steam supply to fuel oil heaters
1001 Under steady steaming conditions, the superheater outlet temperature is regulated by the                     . integral superheater control desuperheater auxiliary desuperheater radiant superheater
1002 Under what operating conditions may water wall header drains be used for blow down? Only if the fires are secured and no steam is being generated. During periods of carryover in the steam drum. When the water level is out of sight in the gage glass. When it is necessary for rapid drainage of the boiler.
1003 Using an oil temperature-viscosity chart, you can determine the recommended                     . fuel oil flash point for best combustion fuel/air ratio for efficient combustion oil temperature for proper atomization oil pressure for smokeless operation
1004 Valve "H" shown in the illustration, functions to                     . regulate the amount of fuel burned provide a quick shut off of fuel to the boiler prevent a backflow from the manifold recirculate fuel oil during start-up
1005 Vapor blowing from the air ejector condenser vent may be caused by                     . insufficient condensate flow excess makeup feed being taken into the system low condensate temperature excessive condensate pump speed
1006 Vent condensers are usually an integral part of deaerating feed heaters and serve to condense                     . only steam vented from high pressure steam traps steam vented from high pressure steam glands the steam vapor entrained with the non- condensable gases the gases liberated by the deaeration process
1007 Vibration or panting of a boiler can be caused by                     . insufficient air poor mixing of air and oil excessive fuel oil temperature all of the above
1008 Warping of superheater screen tubes can be caused by                     . high superheater temperatures high furnace temperatures installing baffles of excessive length sudden cooling of tubes after being overheated
1009 Water circulates in a natural circulation boiler due to the                     . difference in tube length and diameter angle of inclination difference in density between the water and the steam/water mixture difference between the heights of the boiler drums
1010 Water circulates within a natural circulation boiler as a result of the                      . difference in the tube length and diameter angle of tube inclination differences in density within the circulating medium difference between the heights of the boiler drums
1011 Water circulation in a water-tube boiler is a result of the                     . difference between the area and length of the water-tubes differences in water density in boiler tubes velocity added to the water by the feed pump siphon action of steam leaving the drum
1012 Water circulation in a water-tube boiler is a result of the                     . difference between the area and length of the water-tubes differences in density within the circulated water velocity added to the water by the feed pump siphon action of steam leaving the drum
1013 Water emulsified in the fuel oil when supplied to a boiler  is indicated by                     . sputtering of the fires lower than normal fuel oil pressure excessive white smoke all of the above
1014 Water in the fuel supply to a steaming boiler can be detected by                     . observation of the fuel oil heater drains sputtering of the fires panting of the casing dense white smoke being observed in the periscope
1015 Waterboxes on condensers are vented to                     . prevent excessive pressure on tube sheets liberate air pockets and reduce waterside oxidation assure positive flow to the lube oil coolers prevent vapor binding of the circulating pump
1016 Waterboxes on main condensers are vented to                     . prevent excessive pressure on tube sheets liberate air pockets and reduce waterside oxidation provide a minimum condensate level in the hot well prevent vapor binding of the circulating pump
1017 Waterside abrasion of boiler tubes can be caused by                     . entrained impurities in the boiler water improper bends in the tubes oxygen corrosion mechanical tube cleaning
1018 Waterside grooving is usually very difficult to locate in a boiler tube before leakage occurs because                     . detection and confirmation of this type of corrosion requires laboratory examination it occurs only on the interior surfaces of desuperheater tubes it usually occurs in the tube bends near the water drum it occurs in narrow bands along the top of horizontal floor tubes exposed to the products of combustion
1019 Water-tube boiler screen tubes protect which of the listed components from high furnace temperatures? Saturated steam tube bank Superheater tube bank Water drum Refractory
1020 Water-tube boilers having integral uncontrolled superheaters are equipped with internal desuperheaters to                     . lower the temperature of bleed steam in a reheat type plant add moisture to superheated steam lower superheated steam pressure for use in auxiliary machinery provide desuperheated steam for auxiliary machinery
1021 What affect will the emergency plugging of leaking condenser tubes have on the condenser pressure and hot well temperature when returning to normal steam plant sea speed operation? Absolute pressure and hot well temperature will increase Absolute pressure will decrease and hot well temperature will increase Absolute pressure will increase and hot well temperature will decrease Absolute pressure and hot well temperature will decrease
1022 What are the two most common gases that dissolve in boiler water and cause corrosion on the internal parts of the boiler? Oxygen and carbon dioxide Oxygen and carbon monoxide Oxygen and ammonia Oxygen and nitrogen
1023 What boiler water chemistry is necessary to ensure the precipitation of hard scale forming calcium? Hydrazine concentrations should be at the proper level. Boiler water hardness should be high. Boiler water should be slightly acidic. Boiler water should have a reserve of phosphates.
1024 What boiler water test would be given to insure that the boiler water contains sufficient chemicals to transform hard scale forming salts into harmless sludge which would eventually be removed with blow downs? alkalinity test phosphate test chloride test hydrazine test
1025 What causes carbon to adhere to the inside surfaces of a fuel oil heater? Too much carbon in the fuel Deteriorated zinc strips Excessive fuel oil temperature Vanadium in the fuel
1026 What is indicated by the code number 32Y20 stamped on a burner sprayer plate? Sprayer plate orifice area is 0.32 square inch. Sprayer plate requires a size 20 tip. Sprayer plate orifice was made with a size 32 drill. Sprayer plate requires a minimum of 20 psi fuel pressure.
1027 What is the advantage of a forced water circulation boiler over a natural circulation boiler? The circulating pump need not operate when low pressure steam is required. Boiler tubes are less likely to overheat. A steam accumulator is not required. All of the above.
1028 What is the cause of 'laning' in a boiler tube bank? Insufficient airflow Slag accumulation forming between the tubes Low fuel oil pressure High fuel oil temperature
1029 What is the cause of 'laning' in a boiler tube bank? Insufficient airflow Excessive slag accumulation on the tubes Low fuel oil pressure Reduced furnace volume
1030 What is the function of valve "H" of the system shown in the illustration? To regulate the amount of fuel burned. To prevent fuel backflow from the manifold. To provide for quick fuel shut off. To recirculate fuel when lighting off.
1031 What is the main constituent in fuel oil which determines its heat value? Hydrocarbons Oxygen Nitrogen Sulphur
1032 What is the primary function of the water screen tubes in a "D" type marine boiler? Generate the major portion of the steam in the boiler. Increase the temperature of the generating tube bank. Provide a steady supply of water to the water drum. Protect the superheater tubes from the radiant heat of the flames in the furnace.
1033 What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve? The principle by which blow down is accomplished. The manner in which steam pressure causes initial valve opening. The difference in valve relieving capacities. The manner in which lifting pressure is adjusted.
1034 What is the purpose of chemically treating boiler water? To reduce formation of scale on the waterside of the boiler. To reduce to a minimum corrosion of boiler metal. To reduce foaming and moisture carryover. All of the above.
1035 What is the purpose of the movable air doors in an air register? Regulate the temperature of air entering the furnace. Function to open and close the register. Maintain airflow across the forced draft fan. Support the burner distance piece.
1036 What is the quickest way to shutoff the boiler fuel oil supply from inside the fire room? Closing the settling tank suction valves. Trip the quick-closing fuel valve. Close the double bottom suction valves. Open the oil recirculating valves.
1037 What percentage of CO2 in a boiler flue gas analysis would indicate perfect combustion? 0% 3% 6% 12%
1038 What physical changes will occur to the steam within a boiler that has been properly bottled up when additional heat is applied? The steam pressure and it specific volume will remain constant. The pressure will increase and the volume will remain constant. The pressure will remain constant and the specific volume will increase. The pressure will increase and the specific volume will decrease.
1039 What type of boiler is shown in the illustration? A down fired two furnace boiler with a vertical superheater, economizer, waterwalls and downcomers. A Scotch boiler with a horizontal superheater, economizer, waterwalls and downcomers. A two drum, single furnace, D type boiler with an interdeck superheater, an economizer, water walls and downcomers. A sectional header boiler with a superheater, economizer,  and water walls and downcomers.
1040 What type of boiler superheater is shown in the illustration? Overdeck convection tube Vertical U-tube Overdeck integral tube Horizontal U-tube
1041 What type of sensor is normally used with the automatic recirculating valve in the main condensate line? Thermostatic Pressure Continuity Preset electric timing sensor
1042 What unit, or factor creates most of the vacuum within a tight and adequately cooled main condenser once the main engine is in operation? Main condensate pump Main air ejector Condensation of turbine exhaust steam Counterflow of seawater over the surface of the tubes with  the flow of exhaust steam in the tubes
1043 What will occur if the fuel oil heater condensate returns are not opened or are partially plugged? Fuel will become overheated. Fuel consumption will decrease. Fuel may not be heated sufficiently for proper combustion. Fuel pump slippage will result.
1044 When a boiler economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR) require which of the following devices to be installed? A sentinel valve is to be fitted on the superheater outlet. A stop check valve is to be located at the economizer outlet. A stop check valve is to be located at the economizer inlet. An emergency drain line must be provided to the reserve feed tank.
1045 When a boiler flareback occurs, you should                     . reduce the forced draft blower speed close the master fuel oil valve take the boiler off the line increase the fuel oil supply pressure
1046 When a boiler has been secured and is being initially cooled, the water level showing in the steam drum gage glass should be                     . allowed to drop naturally maintained at the normal level maintained at a full glass allowed to go out of sight
1047 When a boiler is up to pressure and is being placed on the line, you should secure the                     . air cock economizer drain superheater vent air heater vent
1048 When a boiler water test indicates a pH value of 6, you should                     . check the DC heater for possible malfunction begin a continuous boiler blow down chemically treat to lower the pH to normal level chemically treat to raise the pH to normal level
1049 When a mixture of steam and water in a boiler has reached the point at which NO further change in state can occur with the addition of heat, the mixture is considered to have reached its                     . supercritical end point critical end point vaporization end point saturation end point
1050 When a propulsion boiler is removed from service for an extended period, why should the firesides be thoroughly dried after water washing? Reduce the probability of corrosion. Prevent flarebacks on lighting off. Prevent cracking of the brickwork. Reduce the possibility of thermal spalling.
1051 When a soot fire occurs, damage to an economizer can be minimized if you                     . maintain feed water flow through the economizer while extinguishing the fire secure the economizer and open the drain valve to prevent steam pressure buildup increase the forced draft fan speed to blow out the fire secure the fires and inject CO2 into the furnace
1052 When a vessel is in port and the boiler automation system continually trips the burner fuel oil solenoid valve, you should                     . wedge the valve in the open position and report it to the chief engineer bypass the solenoid valve and enter the fact in the logbook change the burner and check the flame safeguard system wedge the valve in the open position and reduce the fuel oil pressure at that burner
1053 When a vessel is in port, stack type air heaters are bypassed in order to prevent                     . insufficient air supply to the fires due to the pressure drop across the heater corrosion of the heater due to low stack temperatures excessive back pressure in the furnace due to low flow rates localized heat stressing of air heater surfaces
1054 When answering a full astern bell from half ahead, the superheater outlet temperature on a single furnace boiler will                     . increase sharply with the increased firing rate decrease due to the increase steam volume used decrease momentarily and then increase proportionately with load demand remain the same
1055 When boiler fires begin sputtering, indicating water in the fuel oil settling tank, you should