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单选题
The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.
A
to give off；which
B
giving off；which
C
to give off；that
D
giving off；that
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单选题Hot gas defrosting uses the hot gas from （） to defrost the evaporator.A
starting air bottlesB
diesel enginesC
boilersD
refrigeration compressors
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单选题The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.A
the oil separatorB
the fresh water generatorC
the compressorD
fire pump
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单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）A
reduce heat radiation to the engine roomB
aid in preventing turbocharger overheatingC
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考题
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
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efficiency of M.E turbocharger
考题
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.A
bypass exhaust gas at high loads to prevent excessive back pressureB
bypass a portion of the exhaust gas at peak loads for better efficiencyC
recycle exhaust gas to the turbochargerD
minimize moisture condensation in the boiler gas passages at low loads
考题
单选题Diesel engine mufflers or silencers reduce the engine exhaust noise by （）A
passing the exhaust through long head pipesB
diffusing exhaust vibrations through activated carbon bafflesC
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考题
单选题Diesel engine mufflers accomplish noise reduction by （）A
reducing exhaust gas velocityB
increasing the frequency of gas vibrationC
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单选题Diesel engine exhaust noise can be reduced in an exhaust muffler by （）A
changing the direction of exhaust gas flowB
increasing the exhaust gas velocityC
changing the exhaust gas weightD
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单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）A
provide exhaust back pressureB
prevent exhaust smoke emissionsC
power a reciprocating superchargerD
muffle exhaust gas noise
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单选题After passing through the turbine the exhaust gas is conducted out into the（）.A
intercoolerB
compressorC
cylinderD
open air
考题
单选题The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）A
increase exhaust gas velocity through the boilerB
reduce accumulations of carbon deposits on the heat transfer surfacesC
eliminate exhaust gas pulsations and noiseD
increase the rate of heat transfer to the waterside
考题
单选题The normal color of the exhaust gas of the diesel will be （）A
achromatism or thin grayB
thin whiteC
sky-blueD
black
考题
单选题Generating tubes in waste heat boilers are finned to （）.A
reduce gas flow turbulenceB
prevent exhaust gas corrosionC
increase the rate of combustionD
increase the rate of heat transfer
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单选题A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）A
increasing the linear velocity of the exhaust gasesB
changing directions of exhaust gas flowC
decreasing the temperature of the exhaust gasesD
accelerating the exhaust gas through a reduced size orifice
考题
单选题The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.A
waterB
oilC
heatD
steam
考题
单选题Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）A
Poor combustionB
High cylinder oil consumptionC
Leaking exhaust valvesD
All of the above
考题
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
increase the velocity of exhaust gas flowD
increase the rate of heat transfer
考题
单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）A
Advanced ignitionB
Clogged air intakeC
Leaky exhaust valveD
High exhaust pressure
考题
单选题An indication of an overloaded main propulsion diesel engine is （）A
white smoke in the exhaustB
high exhaust gas pyrometer readingsC
sparks in the exhaustD
blue smoke in the exhaust
考题
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
the temperature and flow quantity of the exhaust gas from M/EB
the quantity of steam demandedC
the rotary speed and the cooling water temperature of main engineD
efficiency of M/ turbocharger
考题
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
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