單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The ability of the governor to prevent fluctuations in engine speed is termed ().

A.sensitivity
B.stability
C.promptness
D.speed droop

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Lube oil filters remove contaminants more efficiently if the oil being filtered is ().

A.under high pressure
B.under low pressure
C.heated to reduce viscosity
D.cooled to increase viscosity