Compressors, Gas Turbines and Jet Engines
Inter-cooling in multistage compressors is done

To minimize the work of compression
To enable compression in two stages
To cool the air during compression
To cool the air at delivery

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Decrease continuously
Increase first at fast rate and then slow
Increase first at slow rate and then fast
First increase, reach maximum and then decrease

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Output and input
Compressor work and turbine work
Actual compressor work and theoretical compressor work
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

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