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JIPMER2007PhysicsThermal Properties of Matter

The temperature of inversion of a thermocouple is 620^ C and the neutral temperature is 300^ C , what is the temperature of cold junction?

Options

  1. A20^ C
  2. B320^ C
  3. C-20^ C
  4. D40^ C

Correct answer

C. -20^ C

Step-by-step solution

The temperature of inversion is higher than the neutral temperature by the same amount as the neutral temperature is higher than the temperature of cold junction. As per Key Idea t_n-t₀=t_i-t_n t₀=2 t_n-t_i Given, t_i=620^ C , t_n=300^ C Hence, t₀= temperature of cold junction aligned & =2 300-620 & =600-620=-20^ C aligned NOTE: Neutral temperature does not change for a metal whether the temperature of cold junction and inversion temperature change by any value.

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