Compressors, Gas Turbines and Jet Engines
The pressure and temperature conditions of air at the suction of compressor are

Atmospheric
Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Slightly less than atmospheric
Slightly more than atmospheric

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

Carbonisation of coal
Passing steam over incandescent coke
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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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Isothermal h.p. to the BHP of motor
Isothermal h.p. to adiabatic h.p.
Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.

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