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The rate of increase of thermo e.m.f. with temperature at the neutral temperature of a thermocouple:

  1. A
    Is negative
  2. B
    Is positive
  3. C
    Is zero
  4. D
    Depends upon the choice of the two materials of the thermocouple

Solution & Step-by-step Explanation

The thermo e.m.f. () varies with temperature () as a parabola. The neutral temperature () is the temperature at which the thermo e.m.f. is maximum.At the maximum of a curve, the derivative (rate of increase) is zero:

Therefore, the rate of increase is zero at neutral temperature.

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The rate of increase of thermo e.m.f. with temperature at the neutral temperature of a thermocouple:
A
Is negative
B
Is positive
C
Is zero
D
Depends upon the choice of the two materials of the thermocouple

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Current ElectricityThermocouple

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