The thermo emf of thermocouple varies wi...

The thermo emf of thermocouple varies with the temperature `theta of the hot junction as `E = atheta + btheta^2` in volts where the ratio `a//b` is `700^@C`. If the cold junction is kept at `0^@C`, then the neutral temperature is

`1400^@C`

`350^@C`

`700^@C`

No neutral temperature is possible for this termocouple.

Text Solution

Verified by Experts

The correct Answer is:

(d) Neutral temperature is the temperature of a hot junction
at which E is maximum.
`rArr (dE)/(dtheta) = 0 or a= 2btheta = 0 rArr theta = (-a)/(2b) = -350`
Neutral temperature can never be negative hence no `theta` is possible.

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