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

Thermodynamic cycle
Thermodynamic system
Thermodynamic process
Thermodynamic law

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Engineering Thermodynamics
Carnot cycle consists of

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

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