Internal Combustion Engines
The spark ignition engines are governed by

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

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

May open and close anywhere
Opens at bottom dead centre and closes at top dead centre
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

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