Correct option is C
(a) b(t)
· This notation is not typically used to represent the controlled output in standard control system diagrams.
(b) r(t)
· This represents the reference input or setpoint of the control system.
· It is the desired value that the system aims to achieve.
(c) c(t)
· This is the correct notation for the controlled output in a control system.
· It represents the actual output of the system, which is being controlled and measured. The notation c(t) stands for "controlled variable at time t."
(d) e(t)
· This represents the error signal in a control system, which is the difference between the reference input r(t) and the controlled output c(t).
Thus, the notation c(t) is used to denote the controlled output in a control system, making option (c) the correct answer.
