Compressors, Gas Turbines and Jet Engines
In the cross compounding of the gas turbine plant

All are connected in series
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
Both the arrangements can be employed

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

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

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