Engineering Thermodynamics
The efficiency of a gas turbine 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
Gases have

Under some conditions one value and sometimes two values of specific heat
Two values of specific heat
No value of specific heat
Only one value of specific heat

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