Internal Combustion Engines
Supercharging is the process of

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

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve opening before top dead center
Inlet valve closing after bottom dead center
Inlet valve closing before bottom dead center
Exhaust valve closing after top dead center

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