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Which of the following is an electromechanical device?

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Which of the following is an electromechanical device?

(a) Induction relay

(b) Thermocouple

(c) LVDT

(d) All of the mentioned

I have been asked this question in homework.

The question is from Mathematical Preliminaries topic in chapter Stability in Frequency Domain of Control Systems

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Best answer
The correct choice is (c) LVDT

The best I can explain: LVDT is the electromechanical device which converts the displacement of the core to the electrical energy by the action of the transformer.

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