單項選擇題Combustion knock occurring in a diesel engine can be caused by ()

A.low coolant temperature
B.insufficient fuel
C.high ambient temperature
D.carbon buildup on the injector tips


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1.單項選擇題Crankcase explosions in propulsion diesel result from()

A.the splashing of lubrication oil by the crankshaft
B.the dilution of crankcase oil with particles of combustion
C.broken fuel lines spraying oil on the crankcase
D.the ignition of unburned fuel and air in the crankcase

3.單項選擇題What is the function of an engine’s stationary parts?()

A.To add power to the engine
B.To keep the engine firmly attached to its supporting base
C.To keep moving engine part in their proper relative positions
D.To rotate the crankshaft

4.單項選擇題An overcorrecting and unstable engine governor operation is known as().

A.droop
B.dead banding
C.dash potting
D.hunting

5.單項選擇題Coolant can be lost from a diesel engine jacket cooling waster system by leakage from()

A.cylinder head cracks
B.piping joints
C.pump leaking
D.all of the above