Engineering Thermodynamics
Stirling cycle consists of

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

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Engineering Thermodynamics
An open system is one in which

Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy

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