Compressors, Gas Turbines and Jet Engines
The overall efficiency of the compressed air system is the

None of these
Ratio of shaft output of the air motor to the shaft input to the compressor
Product of shaft output of air motor and shaft input to the compressor
Ratio of shaft input to the compressor to the shaft output of air motor

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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

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

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