Discussion
Any externally introduced signal affecting the controlled output is called a :
Answer: B
An externally introduced signal affecting the controlled output is called a stimulus.
In control-system terminology the stimulus is the independent input applied to a system from outside, the command or disturbance that sets it responding; the system's reaction is the response. A reference input that commands a new output, and a disturbance that upsets it, are both stimuli in this sense.
Feedback is a signal derived from the output and returned inside the loop, so it is not externally introduced. 'Signal' is too general a word to define anything, and gain control is an adjustment of amplification, not an input to the system.
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