Question

If the cold junction of thermocouple is kept at `0^(@)C` and the hot junction is kept at `T^(@)C`, then the relation between neutral temperature `(T_(n))` and temperature of inversion `(T_(i))` is
A. `T_(n) = (T_(i))/(2)`
B. `T_(n) = 2T_(i)`
C. `T_(n) = T_(i) - T`
D. `T_(n) = T_(i) + T`

Answer 1

Correct Answer - A
We know temperature of inversion `(T_i)` is as much above the neutral temperature `(T_n)` as neutral temperature is above the temperature of the cold junction `(T)`, ie.,
`T_(i)-T_(n)=T_(n)-T or T_(i)=2T_(n)-T`
But, here the cold junction is kept at `0^(@)C`, hence `T=0`
Thus, `T_(i) = 2 T_(n) or T_(n) = (T_i)/(2)`.