For an ordinary four-stroke engine the exhaust valves open ().
- Aafter TDC
- Bbefore TDC
- Cafter BDC
- Dbefore BDC
For an ordinary four-stroke engine the exhaust valves open ().
1、In a four-stroke engine the camshaft r
In a four-stroke engine the camshaft rotates at ().Ahalf the engine speedBtwice the engine speedCthe engine speedDfour times the engine speed
2、The () engine is used for alternators
The () engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.Afour-strokeBtwo-strokeCslow speedDreversible
3、For most ship engines,the fuel is().
For most ship engines,the fuel is().Anatural gasBdiesel oilCpropaneDbunker fuel
4、For an ordinary modem marine four-stro
For an ordinary modem marine four-stroke engine the inlet valves close ().Aafter TDCBbefore TDCCafter BDCDbefore BDC
5、In an ordinary diesel engine the fuel
In an ordinary diesel engine the fuel injection begins ()Aafter TDCBbefore TDCCafter BDCDbefore BDC
6、In the four-stroke engine, it takes ()
In the four-stroke engine, it takes () to make one power stroke.Aone propulsionBtwo propulsionsCtwo revolutionsDone revolutio