GATE Questions & Answers of Routh-Hurwitz and Nyquist Criteria

What is the Weightage of Routh-Hurwitz and Nyquist Criteria in GATE Exam?

Total 3 Questions have been asked from Routh-Hurwitz and Nyquist Criteria topic of Control Systems subject in previous GATE papers. Average marks 1.67.

Loop transfer function of a feedback system is GsHs=s+3s2s-3 Take the Nyquist contour in the clockwise direction. Then, the Nyquist plot of GsHs encircles -1+j0

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

Gs=Ks+1s1+Ts1+2s,  K>0,t>0.

The closed loop system will be stable if,

Nyquist plot of two functions  G1(s) and G2(s) are shown in figure.

Nyquist plot of the product of G1 (s) and G2(s) is