Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

Opens at 20° before top dead center and closes at 40° after bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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Internal Combustion Engines
Supercharging is the process of

Supplying compressed air to remove combustion products fully
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Injecting excess fuel for raising more loads
Providing forced cooling air

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