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单选题
A feed pump for an auxiliary boiler might lose suction if the （）.
A
boiler water level is low
B
feedwater is too hot
C
boiler steam demand is low
D
feedwater is too cold
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更多 “单选题A feed pump for an auxiliary boiler might lose suction if the （）.A boiler water level is lowB feedwater is too hotC boiler steam demand is lowD feedwater is too cold” 相关考题
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The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler()
A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low
考题
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.A.high steam pressure in the boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity
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单选题The most common cause of scale formation in an auxiliary boiler is （）A
concentrations of calcium sulfate in the boiler waterB
fuel oil in the feed waterC
improper treatment of the feed water with calcium sulfateD
excessive feed water alkalinity
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单选题The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）A
in the event of a flame failureB
in the event of a stack fireC
when the water level reach the crown sheetD
when the feed pump discharge pressure drops to a preset minimum
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单选题A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.A
have a greater head capacityB
operate with increased impeller efficiencyC
discharge through the suction side of the pump casingD
require more power to run the shaft
考题
单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
relight the boiler immediately to prevent loss of steam pressureB
relight the fire off the brickwork as the bricks are cherry redC
purge the furnace of any combustible gases before attempting to relight the fireD
speed up the feed pump to prevent dry firing when the burner flame is reestablished
考题
单选题Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.A
fuel pump failureB
fan motor failureC
increased feedwater consumptionD
decreased boiler efficiency
考题
单选题The boiler feed water check valves are located on the （）A
feed pump suction lineB
hot wellC
shell of the feed heaterD
feed lines to the boiler
考题
单选题The static suction lift of a pump is the difference in elevation between the （）.A
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB
centerline of the pump and the suction liquid level when the source of liquid is above the pumpC
centerline of the pump and the level of the discharge liquidD
liquid levels of the suction and discharge
考题
单选题Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）A
sulfite or hydrazineB
sulfite or hygroscopic sulfiteC
bromide or hydrazineD
bromide or hygroscopic sulfite
考题
单选题A pump is said to have "negative suction head" when the pump is located （）.A
between the suction and dischargeB
below the liquid supplyC
above the liquid supplyD
any of the above
考题
单选题The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）A
steam demand is highB
salinity is highC
safety valve simmersD
burner flame is extinguished
考题
单选题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.A
monkeyB
donkeyC
waste heatD
main
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单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）A
air or water in the furnaceB
combustion pulsesC
fuel oil pump failureD
flame failure
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
考题
单选题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.A
furnace to be re-purgedB
electric charge to buildup in the igniterC
fuel pump to restartD
drum level to stabilize
考题
单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）A
High oxygen concentrationB
Low pHC
Proper alkalinityD
All of the above
考题
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.A
one size smaller than the pump suction nozzleB
the same size as the pump suction nozzleC
one size larger than the pump suction nozzleD
installed with a short radius elbow at the pump
考题
单选题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.A
ensure feed water flow into the boilerB
keep the steam drum pressure highC
prevent water hammer in the feed lineD
help the feed water flash to steam
考题
单选题The water level in a steaming auxiliary boiler will always （）A
rise when the steam pressure is increasedB
remain constant as long as the feed pump operatesC
fall when the steam pressure is decreasedD
vary as the steam demand changes
考题
单选题Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）A
increased fuel consumptionB
increased feed water consumptionC
fuel pump failureD
combustion control system failure
考题
单选题Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A
Increased suction head pressureB
Decreased feedwater temperatureC
Pump recirculating line being open too muchD
Excessive feedwater temperature
考题
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.A
caustic embrittlement of the boiler metalB
acidic corrosion of the boiler metalC
hard scale deposits on the boiler tubesD
etching of the heat exchange surfaces
考题
单选题As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressureA
（1）B
（1）and（2）C
（2）D
neither（1）nor（2）
考题
单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A
high steam pressure in the boilerB
abnormally high feed water temperatureC
abnormally high boiler water temperatureD
steam demand exceeding feed pump capacity
考题
单选题After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.A
furnace to be re-purgedB
electric charge to buildup in the igniterC
fuel pump to restartD
dram level to stabilize
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