Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and heat supplied
Net work output and isentropic heat drop
Net work output and work done by turbine
Actual heat drop and isentropic heat drop

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

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

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