单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）
A.the same indicated horsepower as a four-stroke/cycle engine
B.twice the indicated horsepower as a four-stroke/cycle engine
C.one half indicated horsepower as a four-stroke/cycle engine
D.one power stroke for every two crankshaft revolutions
