Compressors, Gas Turbines and Jet Engines
For minimum work required to compress and deliver a quantity of air by multistage compression

The compression ratio in each stage should be same
The work-done in each stage should be same
All of the listed here
The intercooling should be perfect

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

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

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