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单选题
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.
A
gas composition
B
gas temperature
C
pressure
D
timing
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单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A
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单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.A
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bypass a portion of the exhaust gas at peak loads for better efficiencyC
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单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
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increasing the amount of excess air to the burnersD
treating the boiler water with chemical oxygen scavengers
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单选题Waterside scale in a fire-tube boiler may cause （）.A
increased heat transferB
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单选题In an auxiliary boiler steam and water system, the highest pressure will be in the （）.A
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单选题The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）A
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reduce accumulations of carbon deposits on the heat transfer surfacesC
eliminate exhaust gas pulsations and noiseD
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单选题Latent heat changes the （） of water.A
physical stateB
temperatureC
atmospheric pressureD
sensible pressure
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单选题Diesel engine waste heat boiler construction is usually of the fire-tube or（）A
cyclone furnace boiler typeB
dry back boiler typeC
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critical circulation boiler type
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reduce gas flow turbulenceB
prevent exhaust gas corrosionC
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space limitations prevent separately run pipesB
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单选题Fins are installed on the fireside of water-tubes used in waste boiler to（）A
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单选题In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.A
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单选题Fins are installed on the generating tube surfaces in waste heat boilers to （）.A
prevent soot fires in the exhaust systemB
prevent exhaust gas erosion of the tubesC
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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
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prevent water hammer in the feed lineD
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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
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考题
单选题The PRIMARY function of a waste heat boiler is to （）.A
reduce engine exhaust noiseB
reduce engine back pressureC
recover heat which otherwise would be lostD
increase turbocharger efficiency
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
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etching of the heat exchange surfaces
考题
单选题A waste heat boiler is installed on some diesel propelled vessels to （）.A
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heat the waste water tanksD
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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
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考题
单选题A SECONDARY function of a waste heat boiler is to （）.A
reduce engine exhaust noiseB
reduce engine back pressureC
increase engine cycle efficiencyD
increase turbocharger efficiency
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