Engineering Thermodynamics
Extensive property of a system is one whose value

Depends on the mass of the system like volume
Is dependent on the path followed and not on the state
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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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Total internal energy of a system during a process remains constant
Work-done by a system is equal to the heat transferred by the system
Internal energy, enthalpy and entropy during a process remain constant

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Engineering Thermodynamics
Carnot cycle consists of

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

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