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

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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

单项选择题

In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an（）

A.opposed-piston engine
B.double-acting engine
C.two-stroke/cycle engine
D.four-stroke/cycle engine