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GATE 2020 ME (ME1) – Question 27

Thermodynamics · Thermodynamic relations and property charts · 1 mark · Multiple choice

For an ideal gas, the Joule–Thomson coefficient is ______.

  1. positive
  2. negative
  3. zero
  4. indeterminate

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Show answer and explanation

Correct answer: (C) zero

Explanation

For an ideal gas, enthalpy depends only on temperature. Therefore constant enthalpy implies constant temperature during throttling, and $\mu_{JT}=(\partial T/\partial p)_h=\mathbf0$. **Answer: C.**