Engineering Thermodynamics
According to First law of thermodynamics,

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

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Engineering Thermodynamics
Intensive 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
Is not dependent on the path followed but on the state
Does not depend on the mass of the system, like temperature, pressure, etc.

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Engineering Thermodynamics
Otto cycle consists of

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

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