Compressors, Gas Turbines and Jet Engines
Pressure ratio in gas turbines is the ratio of

Highest pressure to exhaust pressure
Inlet pressure to exhaust pressure
Pressures across the turbine
Compressor pressure ratio

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Compressors, Gas Turbines and Jet Engines
The compressor capacity is defined as the

Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
None of these

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