Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Provide robust structure
Convert kinetic energy of air into pressure energy
Collect more air
Beautify the shape

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

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