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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Engineering Thermodynamics
Gases have

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

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