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The thermo emf E of a thermocouple is fo...

The thermo emf E of a thermocouple is found to vary wit temperature T of the junction (cold junction is `0^(@)C`) as
`E=40T-(T^(2))/(20)`
The temperature of inversion for the thermocouple is

A

`100^@ C`

B

`200^@ C`

C

`400^@`

D

`800^@ C`

Text Solution

Verified by Experts

The correct Answer is:
C
Given `E = 40 T- (T^(2) )/( 20)`. At neutral temperature,
`( d E)/( d T)= 0` or `40 - (T)/( 10) = 0` or `T= 400^(@) C`.
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