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For proper feedback in a process control element, it is required to ________

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For proper feedback in a process control element, it is required to ________

(a) measure P

(b) measure set point

(c) measure error

(d) measure comparator

I had been asked this question in an interview for internship.

This is a very interesting question from Process Control System topic in chapter Transducers of Electrical Measurements

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The correct option is (a) measure P

To explain: In a process control element, proper feedback is obtained by measuring the parameter P. Electrical input is required in most of the process controllers as they are electronic in nature.

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