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

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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