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單項選擇題

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.

A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets

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單項選擇題

Which of the following may cause that an engine doesnt turn on starting air?（）

A.too low starting air pressure
B.main starting valve closed
C.neither A nor B
D.A and B

單項選擇題

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