单项选择题
Piston compression rings used in a diesel engine function to （）
A.transfer heat from the cylinder to the piston
B.scrape oil from the sides of the piston
C.seal the combustion space from the crankcases
D.prevent any piston contact with the cylinder liner
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相关考题
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单项选择题
An indicator card or pressure-volume diagram, shows graphically the （）
A.compression ratio of the engine
B.volume of the engine
C.relationships between pressure and volume during one stroke of the engine
D.relationships between pressure and volume during one cycle of the engine -
单项选择题
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 -
单项选择题
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
