GATE Chemical 2025 | Question: 52

Question

The block diagram of a series cascade control system (with time in minutes) is shown in the figure. For $\tau_{l}=8 \: \mathrm{~min}$ and $K_{c}^{s}=1$, the maximum value of $K_{c}^{m}$, below which the cascade control system is stable, is $\_\_\_\_\_\_$ (rounded off to the nearest integer).

Answer 1

ans=10

first we will slove the secondary loop of the cascade control and then after that will solve for Kcm