Engineering Thermodynamics
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from

First law of thermodynamics
Zeroth low of thermodynamic
Second law to thermodynamics
Basic law of thermodynamics

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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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