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单选题
A dark exhaust from a running diesel engine can be caused by （）
A
late ignition
B
water in the fuel
C
high compression temperature
D
starting valve stuck open
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单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
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单选题Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.A
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clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
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high exhaust temperatureB
high lube oil temperatureC
low turbo-charger speedD
low cooling water temperature
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单选题Clogged or partially obstructed exhaust ports on a diesel engine can cause（）A
over-speeding of the engineB
failure of the engine to shut downC
no effect of engine mounting boltsD
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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 color of the exhaust from a diesel engine should be （）A
clearB
hazy light brownC
hazy light blueD
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单选题Black smoke exhausting from an operating diesel engine can be caused by （）A
fuel dribbling from leaking fuel injectorsB
burning fuel with a high carbon contentC
burning fuel with a high vanadium contentD
burning fuel with a lower sulphur content
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单选题Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）A
Carbon dioxideB
Carbon monoxideC
Carbon trioxideD
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单选题Late fuel oil injection in a diesel engine can result in （）A
fuel knockB
increased powerC
low compression pressureD
high exhaust temperature
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overloading the engineB
low exhaust valve liftC
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insufficient mechanical clearance
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单选题A smoking exhaust from an operating diesel engine could be caused by （）A
low sulfur content in the fuelB
a loose injector inlet connectionC
late fuel injectionD
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engine overloadB
low combustion temperatureC
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excessive compression pressure
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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
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accelerating the exhaust gas through a reduced size orifice
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low exhaust back pressureB
air in the fuel systemC
gasket blow-by or leakageD
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单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）A
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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
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单选题Sudden unloading of a diesel engine can cause（）.A
decreased fuel efficiencyB
increased exhaust temperatureC
black smokeD
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