Engineering Thermodynamics
Carnot cycle consists of

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

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Engineering Thermodynamics
An open system is one in which

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
Neither mass nor energy crosses the boundaries of the system

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