Internal Combustion Engines
The object of supercharging the engine is

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

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at top dead center and ends at 30° after top dead center
Starts at 15° after top dead center and ends at 30° before bottom dead center
May start and end anywhere
Starts at 15° before top dead center and ends at 30° after top dead center

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