單項(xiàng)選擇題While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?()

A.Delivery check valve
B.Pump barrel
C.Tubing to the injector
D.Cam follower


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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