Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.

A Below
B At
C Above
D Either B or C

Correct Answer: Below

Above the inversion temperature joule-thomson coefficient $${\left( {\frac{{\partial T}}{{\partial P}}} \right)_H} = - ve$$
So, by throttling (decreasing the pressure) the temperature increases and hence heating.
Below the inversion temperature houle-thomson coefficient $${\left( {\frac{{\partial T}}{{\partial P}}} \right)_H} = + ve$$
So,by throttling the temperature decreases hence cooling.
Bissoy MCQ
#Chemical Engineering #Chemical Engineering Thermodynamics

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