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Which among the following controls the speed of D.C. motor?

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Which among the following controls the speed of D.C. motor?

(a) Galvanometer

(b) Gauss meter

(c) Potentiometer

(d) Tachometer

I had been asked this question in an international level competition.

I'd like to ask this question from The Design Problem topic in division Design of Control Systems

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The correct choice is (d) Tachometer

To explain: D.C. motor is the motor which operates with the direct current as in the construction of DC motors slip rings not commutators and tachometer control the speed of DC motor.

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