Following are the objectives of supercharging
1. To compensate for loss of power due to high altitudes for air craft engines
2. To obtain better performance from the existing engine
3. For a given weight and bulk of the engine, super charging increase power output. This is important in air craft, marine and automotive engines where weight and space are considered
4. Super charging is done to induct more amount of air into cylinder per unit times and hence to burn more amount of fuel to increase power output