單項選擇題

The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

A.the same, whether at sea, or during maneuvering
B.adjusted during each hour of operation while at constant RPM
C.higher at sea than while maneuvering
D.lower at sea than while maneuvering

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單項選擇題

The crankcases of many diesel engines are kept under a slight vacuum to （）

A.improve fuel economy
B.increase the air charge velocity
C.reduce the risk of explosion
D.all of the above

單項選擇題

Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）

A.Increased suction head pressure
B.Decreased feedwater temperature
C.Pump recirculating line being open too much
D.Excessive feedwater temperature

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The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

你可能感興趣的試題

The crankcases of many diesel engines are kept under a slight vacuum to （）

Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）