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单选题
The normal color of the exhaust gas of the diesel will be （）
A
achromatism or thin gray
B
thin white
C
sky-blue
D
black
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reduce exhaust gas temperatureD
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单选题For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）A
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condense and drain moisture from exhaust gasesD
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单选题Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.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
recycle exhaust gas to the turbochargerD
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passing the exhaust through long head pipesB
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increasing the exhaust gas velocityD
reducing the exhaust gas velocity
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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
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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
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单选题The color of the exhaust from a diesel engine should be （）A
clearB
hazy light brownC
hazy light blueD
hazy light grey
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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When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）A
overloading the engineB
low exhaust valve liftC
excessive cylinder coolingD
insufficient mechanical clearance
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单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）A
During operation at low speedB
During operation at rated speed, but low power outputC
During accelerationD
All of the above
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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
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单选题Pyrometers commonly found on diesel engine exhaust systems, consist of（）A
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a heaterB
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单选题Early fuel injection timing is indicated by the cylinder pressure being（）A
above normal with a below normal exhaust temperatureB
above normal with a normal exhaust temperatureC
below normal with a normal exhaust temperatureD
below normal with an above normal exhaust temperature
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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
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单选题An indication of a diesel engine air intake being partially clogged, is （）.A
low firing pressure and low exhaust temperaturesB
low firing pressure and normal exhaust temperaturesC
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high firing pressure and high exhaust temperatures
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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
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单选题An indication of an overloaded main propulsion diesel engine is （）A
white smoke in the exhaustB
high exhaust gas pyrometer readingsC
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blue smoke in the exhaust
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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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