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

Volume of air delivered by the compressor
None of these
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

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

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

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