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ESE 2021 Technical Quiz 27 || Feedback Principle & Frequency Response
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Question 1
The polar plot of G(s) =
for 0
in GH-plane is
for 0 in GH-plane is Question 2
The feedback system shown below oscillates at 2 rad/s when 
Question 3
The Bode plot of a transfer function G(s) is shown in the figure below.
The gain (20 log|G(s)| ) is 32 dB and –8 dB at 1 rad/s and 10 rads/s respectively. The phase is negative for all ω. Then G(s) is
Question 4
Study the standard negative feedback configuration with G(s) = 
and H(s) =0.5. Find the number of clockwise encirclements of (-1, 0) in the Nyquist of the Loop transfer function G(s) H(s) will be
and H(s) =0.5. Find the number of clockwise encirclements of (-1, 0) in the Nyquist of the Loop transfer function G(s) H(s) will be Question 5
A unity feedback system has the following open loop frequency response.
Determine the gain and phase margin
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