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

Carbonisation of coal
Passing steam over incandescent coke
Partial combustion of coal, coke, 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

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

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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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