In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）

A、the inlet port is opened by the up coming piston； the port is closed by the down going

B、the inlet valve is opened by the down going piston；the inlet valve is closed

C、the inlet port is opened by the down going piston；the port is closed by the up coming

D、the inlet valve is opened

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第1题

[单选题] The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）

A、one half crankshaft speed in a two-stroke cycle diesel engine B、crankshaft speed in a two-stroke cycle diesel engine C、two times crankshaft speed in a two-stroke cycle diesel engine D、one-fourth times crankshaft speed in a four-stroke cycle diesel engine

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第2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

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第3题

[] Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.

A、A.higher；reduced B、B.higher；increased C、C.lower；reduced D、D.lower；increased

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第4题

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