Engineering Thermodynamics
The variables which control the physical properties of a perfect gas are

Temperature of the gas
Volume occupied by the gas
All of these
Pressure exerted by the gas

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Engineering Thermodynamics
Stirling cycle consists of

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

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