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单选题
Poor combustion in a diesel engine can be caused by （）.
A
high compression pressure
B
low intake air temperature
C
low exhaust pressure
D
high scavenge air temperature
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
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单选题Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）A
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单选题A dark exhaust from a running diesel engine can be caused by （）A
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starting valve stuck open
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engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
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单选题In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）A
bedplate or baseB
sump or oil panC
cylinder blockD
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单选题Low compression pressure in a diesel engine can be caused by（）A
improperly seating intake valvesB
leaking cylinder liner seal ringsC
late fuel injection timingD
carbon deposits on the piston
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单选题Combustion knock occurring in a diesel engine can be caused by （）A
low coolant temperatureB
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water in the fuel oil supplyB
excessive fuel nozzle holder coolingC
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a leaking fuel injector nozzleB
a clogged air filterC
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poor cooling of cylinder wallsB
improper cooling of the pistonC
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turbine engineB
gas turbineC
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shape of combustion spaceC
turbulence in combustion spaceD
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not enough coolantC
air in the cooling systemD
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