Question

The root-locus diagram for a closed-loop feedback system is shown in the figure. The system is overdamped.

• A. only if $0\le K\le 1$
• B. only if $1<K<5$
• C. only if $K>5$
• D. if $0\le K<1$ or $K>5$

Answer 1

The correct option is D if $0\le K<1$ or $K>5$

For overdamping roots of charracteristic equation should lie on negative axis and be unequal.