Engineering Thermodynamics
Stirling cycle consists of

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

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle

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Engineering Thermodynamics
An isolated system is one in which

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

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