單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題The flywheel reduces speed fluctuations by （）

A.maintaining a constant rack setting
B.storing kinetic energy
C.maintaining equal exhaust pressure
D.maintaining even camshaft speed

4.單項選擇題How often should the lubricating oil of a diesel engine be changed?（）

A.After every trip
B.Every 4000 hours
C.According to manufacturer’s instructions
D.Every time they are shutdown

5.單項選擇題The main function of piston compression rings is to （）

A.prevent excessive cylinder liner wear
B.reduce friction losses in the engine
C.seal the space between the piston and the liner
D.limit upward flow of lube oil into the combustion space