单项选择题
On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A.a spindle lubricator
B.an oil jet
C.internal splashing
D.drilled passages in the crankshaft
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
