With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).

A、A.1

B、B.2

C、C.4

D、D.8

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更多“With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).”相关的问题

第1题

[单选题] Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

A、The direction of pressure on the journal in four-stroke engine is continuously B、positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C、four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D、Low-stroke engines usually consume less lube oil than four-stroke engines

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第2题

[单选题] 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

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第3题

[单选题] The size of the exhaust valve opening is （）

A、most critical in a four-stroke cycle diesel engine B、most critical in a two-stroke/cycle diesel engine C、most critical in a four-stroke/cycle diesel engine if it is turbocharged D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

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第4题

[单选题] Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.

A、a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine B、a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine C、two medium-speed, turbocharged, four-stroke diesel engines D、a variable-speed AC generator