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

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

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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
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

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

Passing steam over incandescent coke
Carbonisation of coal
Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 65°C

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