Compressors, Gas Turbines and Jet Engines
Adiabatic compression is one in which

Work done is maximum
Temperature rise follows a linear relationship
No heat leaves or enters the compressor cylinder during compression
Temperature during compression remains constant

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Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

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

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