Questions & Answers of Root Loci

Question No. 162

The gain at the breakaway point of the root locus of a unity feedback system with open loop transfer function Gs=Kss-1s-4 is

Question No. 65

The open loop poles of a third order unity feedback system are at 0,-1,-2. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?

Question No. 164

An open loop transfer function G(s) of a system is
Gs=Kss+1s+2
For a unity feedback system, the breakaway point of the root loci on the real axis occurs at,

Question No. 28

The root locus of a unity feedback system is shown in the figure

The closed loop transfer function of the system is

Question No. 33

The open loop transfer function Gs of a unity feedback control system is given as

Gs=ks+23s2s+2

From the root locus, it can be inferred that when k tends to positive infinity,

Question No. 38

The characteristic equation of a closed-loop system is s(s+1)(s+3)+k(s+2)=0, k>0. Which of the following statements is true?