Question

A PD controller with transfer function $G_c$ is used to stabilize an open-loop unstable process with transfer function $G_p$, where $G_c = K_c \frac{(T_D s + 1)}{(\frac{T_D}{20})s + 1}$ and $G_p = \frac{1}{(s - 1)(10s + 1)}$, and time is in minutes. From the necessary conditions for closed-loop stability, the maximum feasible value of $T_D$, in minutes, rounded off to 1 decimal place, is _____.

Answer 1

The correct Answers is :22.1 or 22.3 Approx