Engineering Thermodynamics
Extensive property of a system is one whose value

Depends on the mass of the system like volume
Does not depend on the mass of the system, like temperature, pressure, etc.
Is dependent on the path followed and not on the state
Is not dependent on the path followed but on the state

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Heat supplied)
(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 air and a large amount of steam over waste coal at about 650°C
Passing steam over incandescent coke

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