Internal Combustion Engines
Supercharging is the process of

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

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Internal Combustion Engines
Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation
Supercharging at high altitudes is essential
Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy

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

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top dead center
May start and end anywhere
Starts at 40° after bottom dead center and ends at 10° before top dead center

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