Engineering Thermodynamics
Otto cycle consists of

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

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with reversibility and irreversibility of process
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Deals with conversion of mass and energy
Deals with heat engines

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