单项选择题
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
A.loss of suction in the circulating pump
B.leak in the primary cooling system
C.broken raw water pump shaft
D.burned or cracked piston in one cylinder
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相关考题
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单项选择题
In a simple mechanical governor, the （）.
A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod -
单项选择题
The ability of the governor to prevent fluctuations in engine speed is termed （）.
A.sensitivity
B.stability
C.promptness
D.speed droop -
单项选择题
What is the function of the thrust bearing?（）
A.Prevents lateral movement of the slow speed gear
B.Transmits propeller thrust to the hull
C.Keeps spring bearings in line
D.Prevents main reduction gear axial movement
