Engineering Thermodynamics
Gases have

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

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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