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


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1.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

2.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

3.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

4.單項(xiàng)選擇題A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

A.cylinder heads
B.exhaust valves
C.scavenging air
D.injectors

5.單項(xiàng)選擇題Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors