Engineering Thermodynamics
Otto cycle consists of following four processes

Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isothermal and two isentropic
Two isentropic and two constant pressures

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Engineering Thermodynamics
An open system is one in which

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

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