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

Increase in net output but decrease in thermal efficiency
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

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Compressors, Gas Turbines and Jet Engines
The assumption made in two stage compression with inter-cooler is that

The compression in both the cylinders is polytropic
The suction and delivery of air takes place at constant pressure
All of the listed here
There is no pressure drop in the inter-cooler

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