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NEET 2005
Exam
NEET
Year
2005
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2005 · Physics · Thermal Properties of Matter

The temperature of inversion of a thermocouple is 620^ C and the...

The temperature of inversion of a thermocouple is 620∘C620^{\circ} \mathrm{C} and the neutral temperature is 300∘C300^{\circ} \mathrm{C}. What is the temperature of cold junction?

Options

  1. A320∘320^{\circ}
  2. B20∘C20^{\circ} \mathrm{C}
  3. C−20∘C-20^{\circ} \mathrm{C}
  4. D40∘C40^{\circ} \mathrm{C}

Correct answer

C. −20∘C-20^{\circ} \mathrm{C}

Step-by-step solution

T1=20∘C,Tn=300∘CT_1=20^{\circ} \mathrm{C}, T_n=300^{\circ} \mathrm{C}Tn=T1+TC2or 600=620+TC⇒TC=−20∘C\begin{array}{l} T_n=\frac{T_1+T_C}{2} \\ \text{or } 600 =620+T_C \\ \Rightarrow T_C =-20^{\circ} \mathrm{C} \end{array}$$
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