Engineering Thermodynamics
According to First law of thermodynamics,

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

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Engineering Thermodynamics
Otto cycle consists of

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

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