Engineering Thermodynamics
Carnot cycle consists of

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

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Engineering Thermodynamics
Extensive property of a system is one whose value

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

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