Internal Combustion Engines
The object of supercharging the engine is

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

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

Starts at bottom dead centre and ends at top dead centre
May start and end anywhere
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre

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