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Concepts Of Physics MCQ Edition [Volume 2]PhysicsThermal and Chemical Effects of Electric Current

Determine the neutral temperature and the inversion temperature of a copper–iron thermocouple when the reference junction is maintained at 0^ C . Use the data provided in the table.

Options

  1. A659^ C , 330^ C
  2. B270^ C , 540^ C
  3. C330^ C , 659^ C
  4. D165^ C , 330^ C

Correct answer

B. 270^ C , 540^ C

Step-by-step solution

For a copper-iron thermocouple, the neutral temperature T_n is a known standard value, which is 270^ C . The relationship between the inversion temperature T_i , neutral temperature T_n , and the temperature of the cold junction T_c is given by T_i - T_n = T_n - T_c . Given that the reference junction is maintained at T_c = 0^ C , the equation simplifies to T_i = 2T_n . Substituting the value of T_n , we get T_i = 2 270^ C = 540^ C . Thus, the neutral temperature is 270^ C and the inversion temperature is 540^ C .

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