Q.

Which of the graphs shown in fig. represents the variation of thermo emf (e) of a thermocouple with temperature T of the hot Junction ? The cold junction is maintained at 0°C.

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a

b

c

d

answer is D.

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Detailed Solution

In a thermo couple when temperature difference between the junctions is below inversion temperature up to neutral temperature thermo e.m.f will be increased and then decreases up to inversion temperature.
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Which of the graphs shown in fig. represents the variation of thermo emf (e) of a thermocouple with temperature T of the hot Junction ? The cold junction is maintained at 0°C.