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

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

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should decrease
Work done in first stage should be more
Work done in subsequent stages should increase
Work done in all stages should be equal

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