单项选择题

Sludge formation in a diesel engine lube oil system is caused by（）

A.carbonization of oils from the combustion chambers
B.emulsions of lube oil and water
C.coagulation of unburned fuel below the piston rings
D.all of the above

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单项选择题

A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）

A.low lube oil temperature
B.low starting air temperature
C.air in the fuel injection
D.water in the starting air system

单项选择题

Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）

A.To test the starting system
B.To remove air bubbles from the jacket water
C.To ensure that the lube oil system delivers pressure
D.To ensure foreign material (water etc) is not present in the cylinders

单项选择题

In a diesel engine, a positive displacement type blower is usually （）

A.gear drive by the engine
B.driven by an exhaust gas turbine
C.driven by a camshaft
D.driven by separate motor