Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Stator to static enthalpy rise in the stage
Rotor to static enthalpy rise in the stage
Rotor to static enthalpy rise in the stator
Stator to static enthalpy rise in the rotor

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

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

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