單項(xiàng)選擇題

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

A.it has a longer power stroke
B.more air gets into the cylinder each stroke
C.it develops twice as many power strokes at the same speed
D.higher combustion pressure is developed

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單項(xiàng)選擇題

Lube oil cannot be efficiently filtered if its （）.

A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs

單項(xiàng)選擇題

In using reduction gears to obtain efficient propeller speeds, （）.

A.they must be located at the after end of the engine
B.they can only be used with one engine at a time
C.they eliminate the need for controllable pitch propellers
D.they are connected to the engine with a flexible coupling

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For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

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Lube oil cannot be efficiently filtered if its （）.

In using reduction gears to obtain efficient propeller speeds, （）.