单项选择题

The function of diesel engine piston compression rings is to （）.

A.prevent piston side thrust
B.prevent engine friction losses
C.transmit heat from the piston to the cylinder liner
D.remove oil from the cylinder combustion space

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单项选择题

A diesel engine piston ring face is in direct contact with the （）.

A.top of the ring groove
B.cylinder liner oil film
C.bottom of the ring groove
D.back of the ring groove

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

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