Question

The block diagram of a system is shown in the figure.



If the desired transfer function of the system is $\frac{C\left(s\right)}{R\left(s\right)}=\frac{s}{s^2+s+1}$, then $G\left(s\right)$ is

• A. $1$
• B. $s$
• C. $\frac{1}{s}$
• D. $\frac{-s}{s^3+s^2-s-2}$

Answer 1

The correct option is B $s$

For all the given values of $G\left(s\right)$ in options, $G\left(s\right)$ does not satisfy the desired condition. But option (b) is official answer given by IIT.