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Strain gauge works on the principle of _______

(a) piezo-electric effect

(b) barkhausen criterion

(c) piezo- resistive effect

(d) feedback element effect

I got this question by my college director while I was bunking the class.

This interesting question is from Characteristics of Resistance Wire Strain Gauge topic in chapter Transducers of Electrical Measurements

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Right choice is (c) piezo- resistive effect

Explanation: A semiconductor strain gauge works on the principle of piezo-resistive effect. Piezo-resistive effect is the change in the value of the resistance due to a change in the resistivity of the semiconductor.

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