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Theorems for Differentiability

Explain neutr...

Question

Explain neutral and inversion temperatures with the help of a graph between the thermo emf and the temperature of the hot junction in a thermocouple.

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Solution

Here, $T_{c}$ is the temperature of the cold junction which is maintained at $0^{o} C$ .
$T$ is the temperature of the hot junction.
$T_{n}$ is the neutral temperature and $T_{i}$ is the inversion temperature.
The temperature of the hot junction at which thermo-emf in the thermocouple becomes maximum is called neutral temperature $T_{n}$ for that thermocouple. For a given thermocouple, $T_{n}$ has a fixed value.
On further increasing the temperature of the hot junction,after $T_{n}$ has reached, the thermo-emf decreases and becomes equal to $0^{o} C$ at a particular temperature called temperature of inversion $T_{i}$ .

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