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單項選擇題

During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）

A.Intake stroke
B.Compression stroke
C.Exhaust stroke
D.Pumping stroke

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單項選擇題

A piston is at bottom dead center when it is（）

A.opening the exhaust ports
B.closing the fuel ports
C.farthest from the cylinder head
D.nearest to the cylinder head

單項選擇題

The average pressure exerted on piston during each power stroke is termed（）

A.indicated horsepower
B.mean effective pressure
C.exhaust back pressure
D.compression pressure

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