Question

In a thermocouple, the temperature of the cold junction and the neutral temperature are –40°C and 275°C respectively. If the cold junction temperature is increased by 60°C, the neutral temperature and temperature of inversion respectively become (a) 275°C, 530°C (b) 355°C, 530°C (c) 375°C, 590°C (d) 355°C, 590°C

Answer 1

Answer:

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Answer 2

Answer:

Answer C

Explanation:

When the temperature of cold junction is increased,the neutral temperature remains constant for a given thermocouple and it is independent of the temperature of the cold junction.

Therefore θ

n

=275

∘

C

We know that θ

i

=2θ

n

−θ

c

=2×275−(−40+60)

=550−20=530°C