Question

Feedback control systems are

• A. insensitive to both forward and feedback path parameter changes
• B. less sensitive to feedback path parameter changes than to forward path parameter changes
• C. less sensitive to forward path parameter changes than to feedback path parameter changes
• D. equally sensitive to forward and feedback path parameter changes

Answer 1

The correct option is C less sensitive to forward path parameter changes than to feedback path parameter changes

$\because S_G^{T.F}=\frac{1}{1+GH}$

$\left|S_H^{T.F}\right|=\frac{GH}{1+GH}$

$\Rightarrow$ less sensitive to 'Change in G' than change in H'