Engineering Thermodynamics
A definite area or a space where some thermodynamic process takes place is known as

Thermodynamic system
Thermodynamic process
Thermodynamic law
Thermodynamic cycle

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Engineering Thermodynamics
Otto cycle consists of

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

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