Engineering Thermodynamics
The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

Enthalpy
Entropy
Internal energy
External energy

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Engineering Thermodynamics
Otto cycle consists of

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

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