Compressors, Gas Turbines and Jet Engines
In multistage compressor, the isothermal compression is achieved by

By insulating the cylinder
By constantly cooling the cylinder
Employing inter-cooler
By running compressor at very slow speed

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Increase in both thermal efficiency and net output
Decrease in both thermal efficiency and net output
Increase in thermal efficiency but decrease in net output
Increase in net output but decrease in thermal efficiency

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