Value of error wrt to controller output

Q.  Consider the below diagram of Two Position Control. What would be the value of error, when the controller output takes a fixed value corresponding to the 'ON' position of final control element?
- Published on 15 Sep 15
Two-Position-Control.png


a. zero
b. less than zero
c. more than zero
d. unpredictable

ANSWER: more than zero

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