Engineering Thermodynamics
Stirling cycle consists of

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

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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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