單項選擇題

A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）

A.loss of additives from the lube oil
B.carbon deposits in the lube oil
C.excessive centrifuging
D.excessive fuel dilution

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單項選擇題

Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）

A.erosion and cratering of the nozzle orifices
B.fuel leakage into the nozzle drain line
C.fuel leakage before and after injection
D.insufficient fuel delivery though that nozzle

單項選擇題

Diesel engine cylinder head test cocks are used to （）

A.check cylinder lubrication
B.connect the pressure indicator pressure
C.test cylinder heads
D.connect the exhaust gas pyrometers

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