Question

In a temperature sensing element ________

(a) low value of α is required

(b) infinite value of α is required

(c) α must be zero

(d) high value of α is required

I have been asked this question in an interview.

The doubt is from Resistance Temperature Detector in chapter Transducers of Electrical Measurements

Answer 1

The correct choice is (d) high value of α is required

The best I can explain: In order to achieve a large change in the value of resistance for a small change in the value of temperature, high value of α is required. Change in resistance is measured through a Wheatstone’s bridge.