Internal Combustion Engines
The spark ignition engines are governed by

Combination of (B) and (C)
Qualitative governing
Hit and miss governing
Quantitative governing

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at 10° after top dead center and closes 20° before the bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
May open and close anywhere

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