Engineering Thermodynamics
Stirling cycle consists of

Two constant volume and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
Two constant volume and two isothermal processes
Two constant pressure and two isothermal processes

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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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