Compressors, Gas Turbines and Jet Engines
The efficiency and work ratio of a gas turbine plant can be increased by

All of these
Adding heat exchanger
Reheating the air after partial expansion in the turbine
Injecting water in/around combustion chamber

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of the compressor is defined as the ratio of

Volume of free air delivery per stroke to the swept volume of the piston
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Isentropic power to the power required to drive the compressor
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio

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

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

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