Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Pressures at discharge and suction corresponding to same temperature
Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Absolute discharge pressure to the absolute intake pressure

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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 but increases thermal efficiency
Decreases net output and thermal efficiency both

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