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（）
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、In a four-stroke/cycle diesel engine,
In a four-stroke/cycle diesel engine, badly worn intake valve guides can cause excessive（）.Aexhaust pressureBexhaust temperaturesCcooling water temperaturesDlube oil consumptio