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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) Any of the mentioned

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

My question is from Solution of State Equations topic in division State Variable Analysis and Design of Control Systems

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The correct choice is (c) LVDT

The explanation: LVDT is linear variable differential transformer which is an inductive transducer and converts the displacement of the core to the electrical energy and also is electromechanical device.

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