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

Q.  What must be the initial temperature of gas for achieving cooling effect in Joule-Kelvin expansion?
- Published on 20 Aug 15

a. the initial temperature must be above the maximum inversion temperature
b. the initial temperature must be below the maximum inversion temperature
c. the initial temperature must be equal to the maximum inversion temperature
d. the maximum inversion temperature has nothing to do with cooling effect in Joule-Kelvin expansion

ANSWER: the initial temperature must be below the maximum inversion temperature

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