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The temperature of inversion of a thermo-couple is 620°C and the neutral temperature is 300°C. What is the temperature of cold junction?

1. 320°C
2. 20°C
3. −20°C
4. 40°C

Correct answer: 20°C

Solution

The temperature of inversion (T_i) is related to the neutral temperature (T_n) and the cold junction temperature (T_c) by the formula T_i = 2T_n - T_c. Substituting T_i = 620°C and T_n = 300°C, we get 620 = 2(300) - T_c, which simplifies to T_c = 20°C.

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