Q. In a thermocouple, which of the following statements is not true
A) Neutral temperature depends upon the nature of materials in the thermocouple
B) Temperature of inversion depends upon the temperature of cold junction
C) When the temperature of the hot junction is equal to the temperature of inversion, the thermo $e$mf becomes zero
D) When the temperature of cold junction increases, the temperature of inversion also increases
Explanation
(d) Temperature of cold junction $T_{c},$ temperature of inversion $T_{i}$ and neutral temperature $T_{n}$ are related as follows
$T_{n} = \frac{T_{i} + T_{c}}{2} \Rightarrow T_{i} = 2T_{n} - T_{c}$
As $T_{n}$ is constant for a given thermocouple $T_{i}$ decreases with increase in $T_{c}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.