Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Bled gas from turbine is heated and readmitted for complete expansion
Heated
Exhaust gases drive the compressor
Compressed air before entering the combustion chamber is heated

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

None of the listed here
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
Volume of air delivered by the compressor

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