單項選擇題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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1.單項選擇題The highest loads applied to the diesel engine crankshaft main bearings are ()

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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題A diesel engine emits blue exhaust smoke as a result of()

A.cold intake air
B.excessive compression pressure
C.excessive cylinder lubrication
D.a light load

5.單項選擇題Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires()

A.grinding the spare plunger to the barrel
B.replacing the plunger and the barrel
C.highly polishing both the plunger and barrel
D.replacing plunger only