Engineering Thermodynamics
A closed system is one in which

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

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Engineering Thermodynamics
Otto cycle consists of

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

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is not dependent on the path followed but on the state
Is dependent on the path followed and not on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume

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