Compressors, Gas Turbines and Jet Engines
Ram compression in turbojet involves

Compression of inlet air
Lost work
Increasing speed of incoming air
Reduction of speed of incoming air and conversion of part of it into pressure energy

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

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

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