Initial state of gas to achieve cooling effect in Joule-Kelvin expansion - Thermodynamics

Q.  In the Joule-Kelvin expansion of a gas, what should be the initial state of gas to obtain maximum cooling effect?
- Published on 20 Aug 15

a. the initial state of the gas should lie in cooling region
b. the initial state of the gas should lie in heating region
c. the initial state of the gas should lie on inversion curve
d. none of the above

ANSWER: the initial state of the gas should lie on inversion curve

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