單項(xiàng)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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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

單項(xiàng)選擇題

Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）

A.Lube oil pressure and temperature
B.jacket water pressure and temperature
C.Engine over-speed
D.Lube oil sump level