Engineering Thermodynamics
An open system is one in which

Neither mass nor energy crosses 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
Both energy and mass cross the boundaries of the system

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Engineering Thermodynamics
Otto cycle consists of

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

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