單項(xiàng)選擇題

In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）

A.once every crankshaft revolution
B.once every two crankshaft revolutions
C.once every piston stroke
D.twice every piston stoke

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單項(xiàng)選擇題

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）

A.entirely constant pressure
B.entirely constant temperature
C.a combination of constant volume and constant pressure
D.a combination of constant temperature and constant pressure

單項(xiàng)選擇題

The over-speed trip device installed in some diesel engines is automatically actuated by（）

A.spring force
B.hydraulic pressure
C.centrifugal force
D.mechanical linkage