To reduce mass of the engine per brake power

To reduce space occupied by the engine

To increase the power output of an engine when greater power is required

All of the above

F.P = B.P - I.P

F.P = I.P - B.P

F.P = B.P / I.P

F.P = I.P / B.P

Mechanical efficiency

Overall efficiency

Indicated thermal efficiency

Volumetric efficiency

In gas turbine plants

For operating pneumatic drills

In starting and supercharging of I.C engines

All of the above

Compression ratio

Expansion ratio

Compressor efficiency

Volumetric efficiency