Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Sum of heat and work transfer will be zero
Process is thermodynamically in equilibrium
Its entropy will change due to irreversibility
Process is executed in closed system cycle

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Engineering Thermodynamics
Stirling cycle consists of

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

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