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GATE 2020 || Control Systems || Nyquist Stability Crirteria & Analysis Quiz 1

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Question 1

If a Nyquist plot cuts the negative real axis at a distance of 0.6. Then the gain margin of the system is _______.

Question 2

Consider the following Nyquist plot of loop transfer function over ω = 0 to ω = ∞. Which of these plot’s represents a stable closed loop system.

Question 3

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

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

Question 4

Given below is the polar plot for the transfer function:


Which transfer function represents the following polar plot?

Question 5

If x = Re{G(jω)} and y = Img{G(jω)} then for ω → 0+, the Nyquist plot for becomes asymptotic to the line

Question 6

In the GH(s) plane, the Nyquist plot of the loop transfer function G(s) H(s) = passes through the negative real axis at the point
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Sep 1ESE & GATE EE