单项选择题

Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?（）

A.Hydraulic oil pressure
B.Servomotor action
C.Flyweight centrifugal force
D.Relay motion

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单项选择题

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

单项选择题

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

单项选择题

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