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單項選擇題

If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke

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單項選擇題

Low cylinder compression pressure and a high exhaust temperature may indicate （）

A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature

單項選擇題

Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）

A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above

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