In a thermocouple the cold junction is at $30^{0}$ C. The temperature of inversion is found to be $540^{0}$ C. Then the neutral temperature is

270C

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510C

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285C

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240C

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Solution

The correct option is C 285C
$T_{n} - T_{c} = T_{i} - T_{n}$
$T_{n}$ =temperature at neutral junction
$T_{c}$ =temperature at cold junction
$T_{i}$ =temperature at inversion junction
$T_{n} = \frac{570}{2} = 285 C$

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