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Which of the following is the input to a controller?

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Which of the following is the input to a controller?

(a) Servo signal

(b) Desired variable value

(c) Error signal

(d) Sensed signal

I got this question during an online exam.

This intriguing question originated from Linear Approximation of the Non-Linear System topic in division Control System and Components of Control Systems

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Best answer
Right answer is (c) Error signal

To explain: Error signal is the input to the controller and it causes the output to be the desired output.

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