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PMDC device is commonly employed for:

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PMDC device is commonly employed for:

(a) Speed feedback in speed control system

(b) Internal velocity feedback loop of a position control system

(c) This device is used in both speed feedback and internal velocity feedback control

(d) None of the mentioned

This question was posed to me in an interview for internship.

This key question is from Controller Components topic in chapter Control System and Components of Control Systems

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Right answer is (c) This device is used in both speed feedback and internal velocity feedback control

The explanation is: The current rating of this type of device is very small and it is to be connected to the input end of the OP-AMP.

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