單項(xiàng)選擇題

Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

A.Defective temperature controls in the system
B.Cavitation in the cooling water pump
C.Opened vent in the cooling system
D.Restricted water passages in the engine

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單項(xiàng)選擇題

If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.

A.cylinder compression pressure may not be high enough
B.cylinder compression temperature may be too high
C.fuel oil injection pressure may not be high enough
D.scavenge and purge process is incomplete

單項(xiàng)選擇題

Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.

A.reduce engine horsepower output
B.aid in silencing the exhaust noise
C.increase the mean effective pressure
D.contribute to effective cylinder scavenging

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