Engineering Thermodynamics
Producer gas is obtained by

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 650°C
Carbonization of bituminous coal
Passing steam over incandescent coke

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Isentropic increase in temperature)/(Actual increase in temperature)
(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Heat supplied)
(Net work output)/(Work-done by the turbine)

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