Internal Combustion Engines
The object of supercharging the engine is

To reduce space occupied by the engine
All of these
To increase the power output of an engine when greater power is required
To reduce mass of the engine per brake power

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Internal Combustion Engines
Scavenging air in diesel engine means

Forced air for cooling cylinder
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Air used for combustion sent under pressure
Burnt air containing products of combustion

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