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
Intercooling in gas turbines

Increases net output and thermal efficiency both
Increases net output but decreases thermal efficiency
Decreases net output and thermal efficiency both
Decreases net output but increases thermal efficiency

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