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单选题
A sudden drop in diesel engine cylinder compression pressure can be caused by（）
A
a leaking fuel injector nozzle
B
a clogged air filter
C
excessively early fuel injection
D
malfunctioning valves
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chemical analysisB
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high compression pressureC
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单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
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poor contact between compression rings and liner
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单选题A diesel engine emits blue exhaust smoke as a result of（）A
cold intake airB
excessive compression pressureC
excessive cylinder lubricationD
a light load
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单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）A
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Transmit heat from the piston to the cylinder linerC
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
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单选题Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）A
increased horsepowerB
reduced efficiencyC
increased heat lossD
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
burned valves
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单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
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单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
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fuel consumption, efficiency, and cylinder pressureD
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excessively worn fuel pump plungerD
excessive exhaust back pressure
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injection lineC
cylinder indicator cockD
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单选题A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injector nozzleB
a clogged air filterC
excessively early fuel injectionD
malfunctioning valves
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单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
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单选题Piston compression rings used in a diesel engine function to （）A
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scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
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check cylinder lubricationB
connect the pressure indicator pressureC
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单选题In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.A
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单选题The highest pressure in a diesel engine cylinder normally occurs （）.A
at TDCB
before TDCC
after TDCD
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