A dark exhaust from a running diesel e

1、The color of the exhaust from a diesel

The color of the exhaust from a diesel engine should be （）AclearBhazy light brownChazy light blueDhazy light grey

2、White smoke exhausting from a diesel e

White smoke exhausting from a diesel engine can be caused by （）Alow combustion temperatureBa leaking fuel nozzle check valveClate fuel injectionDplugged oil-scraper ring hole

3、White smoke exhausting from a diesel e

White smoke exhausting from a diesel engine can result from （）Ahigh exhaust temperatureBhigh lube oil temperatureClow turbo-charger speedDlow cooling water temperature

4、If a diesel engines exhaust temperatur

If a diesel engines exhaust temperature is abnormally high, the cause could be（）Atoo light of a loadBinjection timing is too earlyCoverloading of the engineDtoo low of a compression ratio

5、The exhaust system of a diesel engine

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise

6、A smoking exhaust from an operating di

A smoking exhaust from an operating diesel engine could be caused by （）Alow sulfur content in the fuelBa loose injector inlet connectionClate fuel injectionDhigh injection pressure