Question

Any externally introduced signal affecting the controlled output is called a

(a) feedback

(b) stimulus

(c) signal

(d) gain control

The question was posed to me by my school teacher while I was bunking the class.

The question is from Closed-Loop Transfer Function topic in division Automatic Control of Machine Dynamics

Answer 1

The correct choice is (b) stimulus

For explanation I would say: The instrument measuring the output of the machine for comparison with the input to the machine is known as feedback. Any externally introduced signal affecting the controlled output is called a stimulus.