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单选题
The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A
prevent engine back pressure at heavy loads
B
increase total engine efficiency at low loads
C
prevent boiler corrosion at low engine loads
D
improve engine fuel consumption at any load
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更多 “单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）A prevent engine back pressure at heavy loadsB increase total engine efficiency at low loadsC prevent boiler corrosion at low engine loadsD improve engine fuel consumption at any load” 相关考题
考题
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
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A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold
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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
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The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
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In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge
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A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
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单选题The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）A
increase the density of the intake airB
decrease turbocharger power usageC
reduce exhaust gas temperatureD
compensate for turbocharger PRM fluctuations
考题
单选题For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）A
chemical analysisB
back pressure readingsC
pyrometer readingsD
infrared analysis
考题
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
condense and drain moisture from exhaust gasesD
dampen exhaust gas pulsations in the manifold
考题
单选题Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.A
performanceB
horsepower outputC
fuel consumptionD
scavenge effect
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
increasing the exhaust gas velocityD
reducing the exhaust gas velocity
考题
单选题Improperly fitted piston rings in a diesel engine can cause（）A
excessive lube oil consumptionB
lower than normal lube oil temperatureC
higher than normal exhaust back pressureD
excessive crankshaft end play
考题
单选题Diesel engine mufflers accomplish noise reduction by （）A
reducing exhaust gas velocityB
increasing the frequency of gas vibrationC
the use of long head pipesD
the use of zinc electrodes
考题
单选题Diesel engine cylinder head test cocks are used to（）A
check cylinder lubrication prior to starting engineB
connect exhaust gas analyzers to determine engine efficiencyC
pressure test cylinder heads to check for leaksD
remove moisture accumulations from cylinder prior to starting
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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
increasing the exhaust gas static pressure
考题
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
考题
单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.A
reduce the engine driven fuel pump outlet pressureB
retard the fuel injector timing to reduce powerC
increase the fuel rack settingD
reduce the load on the engine
考题
单选题Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）A
Blank off the exhaust gas inlet to the damaged turbochargerB
Secure cooling and lubrication to the damaged turbochargerC
Lock the rotor of the damaged turbochargerD
All of the above
考题
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In a diesel engine, a positive displacement type blower is usually （）A
gear drive by the engineB
driven by an exhaust gas turbineC
driven by a camshaftD
driven by separate motor
考题
单选题Pyrometers commonly found on diesel engine exhaust systems, consist of（）A
pyrostats and a voltmeterB
a gas-filled bellows, a tube and a pressure gaugeC
thermocouples and a voltmeterD
ammeters and thermocouples
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When fuel is injected in a diesel engine cylinder too early, （）A
ignition may be delayedB
fuel economy is not affectedC
exhaust gas temperature will be unchangedD
the exhaust will be clear
考题
单选题The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.A
large conical springsB
compressed air pressureC
hydraulic pressureD
exhaust gas 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“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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