The temperature of the cold junction of thermocouple is 0°C and the temperature of hot junction is T^o C. The emf is E = 16T - 0.04T² µV. The inversion temperature T_f is

300^o C

200^o C

500^o C

400^o C

Solution

400^o C

The thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at different temperatures.

Given emf E = 16 T - 0.04 T² μV

At inversion temperature, E = 0

⇒ 16 T - 0.04T² = 0

⇒ 0.04 T² = 16T

⇒ T_f = $\frac{16}{0.04}$

⇒ T_f = 400^o C

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