單項(xiàng)選擇題The overspeeding of the diesel engine driving an electric generator could cause （）.

A.low voltage trip to trip
B.reverse power trip to trip
C.damage to windings
D.excessive exhaust temperatures


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1.單項(xiàng)選擇題During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

A.ensure penetration and distribution of the fuel in the combustion chamber
B.ensure the needle valve is flushed clean during each injection
C.prevent combustion gas blowback into the open needle valve
D.prevent reflected pressure waves when the needle valve closes

2.單項(xiàng)選擇題A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）

A.slightly less than atmospheric pressure
B.approximately equal to exhaust manifold pressure at all times
C.that is widely fluctuating constantly
D.decreasing as engine load increases

3.單項(xiàng)選擇題The lube oil pump used in a diesel engine is a （）.

A.volute pump
B.centrifugal pump
C.diaphragm pump
D.gear pump

4.單項(xiàng)選擇題Most fuel injection nozzles are opened by （）.

A.fuel oil pressure
B.a cam operated follower
C.a spring-loaded pressure plate
D.timing gears keyed to the crankshaft

5.單項(xiàng)選擇題The total starting air capacity required for reversible main engines is to be sufficient for at least （）.

A.six consecutive starts
B.eight consecutive starts
C.ten consecutive starts
D.twelve consecutive starts