单项选择题

Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

A.cylinder valves
B.compression rings
C.piston skirts
D.oil rings

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单项选择题

The highest loads applied to the diesel engine crankshaft main bearings are （）

A.axial loads
B.firing loads
C.inertia loads
D.centripetal loads

单项选择题

For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）

A.moving the governor control to stop
B.shutting off the lubricating oil supply
C.tripping the governor emergency stop lever
D.shutting off the fuel supply

单项选择题

If a diesel engine is smoking excessively under load, the cause could be （）

A.low exhaust back pressure
B.early fuel injection in one of the cylinders
C.compression pressure in one of the cylinders
D.plugged injector holes