Compressors, Gas Turbines and Jet Engines
In a double acting compressor, the air is compressed

In two cylinders
In two cylinders on both sides of the piston
In a single cylinder on both sides of the piston
In one cylinder

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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

Heated
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

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