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The temperature of a coil cannot be measured by which of the following methods?

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The temperature of a coil cannot be measured by which of the following methods?

(a) Thermometer

(b) Increase in resistance of the coil

(c) Thermo-junctions embedded in the coil

(d) Calorimeter

I had been asked this question in final exam.

The query is from Temperature Coefficient of Resistance in division Simple DC Networks of Basic Electrical Engineering

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The correct answer is (d) Calorimeter

The explanation is: Calorimeter measures the amount of heat and not the temperature of the coil. The temperature of a coil is mainly measured by thermometer. Resistance of coil increase with an increase in temperature of coil so we can measure temperature using this method. Another method is the formation of thermocouple inside coil due to high temperature at one end and low temperature at other ends.

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