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
点击查看答案&解析
相关考题
-
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
