If a four-stroke/cycle diesel engine i

1、If a diesel engine were running at 20%

If a diesel engine were running at 20% overload with a smoky exhaust, you should（）Astop the engine immediately to prevent damageBincrease lube...

2、In a four-stroke cycle diesel engine t

In a four-stroke cycle diesel engine the intake valves open （）Abefore TDC and close after BDCBafter TDC and close after BDCCbefore TDC and close before BDCDafter TDC and close before BDC

3、If a diesel engine starts firing, but

If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）Ainsufficient fuel supplyBfaulty governorChigh exhaust back pressureDall of the above may cause this problem

4、Turbocharged four-stroke/cycle diesel

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.Aimproving cylinder scavengingBpreheating the combustion chamberCreducing air charge densityDpreventing valve wear

5、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

6、If a four-stroke/cycle diesel engine i

If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）Aon the power strokeBon the exhaust strokeCat the end of the power strokeDat the start of the intake stroke