Engineering Thermodynamics
The work ratio of a gas turbine plant is given by

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

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Engineering Thermodynamics
Producer gas is obtained by

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Carbonization of bituminous coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C

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