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單項(xiàng)選擇題

Lubricating oil viscosity in an operating diesel engine can be reduced by（）

A.increasing cooling water flow
B.increasing lube oil flow
C.dilution by fuel oil
D.adding SAE 70 oil

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單項(xiàng)選擇題

A defective injector nozzle in a propulsion diesel engine can cause（）

A.engine power losses
B.smoking due to unburned fuel
C.high exhaust temperature readings
D.all of the above

單項(xiàng)選擇題

The major cause of problems occurring with fuel injection equipment is（）

A.incorrect replacement of barrels and plungers of jerk pumps
B.overheating of the nozzle orifices
C.cracked pump housings
D.dirt in the fuel