單項選擇題To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.

A.reduce the engine driven fuel pump outlet pressure
B.retard the fuel injector timing to reduce power
C.increase the fuel rack setting
D.reduce the load on the engine


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1.單項選擇題A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.

A.double-acting engine
B.opposed pistons engine
C.single-acting engine
D.horizontal acting engine

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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