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

单项选择题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

单项选择题An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）

A.holed
B.fouled
C.clean
D.dry

单项选择题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

单项选择题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

单项选择题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