The temperature of inversion of a thermocouple is 620 and the neutral temperature is 300. What is the temperature of cold junction? (a) 20 (b) 120 (c) -20 (d) -120

Answer: (c). Tn = (Tc + Ti)/(2) ⇒ Tc = 2Tn - Ti. Tc = 2(300) - 620 = -20. So the answer is (c) -20.

The temperature of inversion of a thermocouple is 620 and the neutral… | NEET 2005 (AIPMT)

Q73NEET 2005 · AIPMTEasy

Electrical Power & Heating Effect

The temperature of inversion of a thermocouple is $620^\circ\text{C}$ and the neutral temperature is $300^\circ\text{C}$ . What is the temperature of cold junction?

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Answer: (c)

$T_n = \dfrac{T_c + T_i}{2} \Rightarrow T_c = 2T_n - T_i$ .
$T_c = 2(300) - 620 = -20^\circ\text{C}$ .
So the answer is (c) $-20^\circ\text{C}$ .

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