The temperature of inversion of a thermocouple is $700^{o} C$ and the neutral temperature is $365^{o} C$ . Then the temperature of cold function must be

0^{o} C

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30^{0} C

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35^{o} C

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65^{o} C

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Solution

The correct option is B $30^{0} C$
$G i v e n :$ $t_{i} = 700^{o} C$ ; $t_{n} = 365^{o} C$
$S o l u t i o n :$ As we know the temperature of inversion is higher than the neutral temperature by the same amount as the neutral temperature is higher than the temperature of cold junction. Hence, $t_{n} - t_{0} = t_{i} - t_{n} \Rightarrow t_{0} = 2 t_{n} - t_{i}$
Given $t_{i} = 700^{\circ} C, t_{n} = 365^{\circ} C$
Hence, $t_{0} =$ temperature of cold junction
$2 \times 365 - 700 = 730 - 700 = 30^{\circ} C$
$S o, t h e$ $c o r r e c t$ $o p t i o n : B$

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