1
GATE ECE 2024
MCQ (Single Correct Answer)
+1
-0.33

In the context of Bode magnitude plots, 40 dB/decade is the same as ______.

A

12 dB/octave

B

6 dB/octave

C

20 dB/octave

D

10 dB/octave

2
GATE ECE 2022
MCQ (Single Correct Answer)
+1
-0.33

Consider a closed-loop control system with unity negative feedback and KG(s) in the forward path, where the gain K = 2. The complete Nyquist plot of the transfer function G(s) is shown in the figure. Note that the Nyquist contour has been chosen to have the clockwise sense. Assume G(s) has no poles on the closed right-half of the complex plane. The number of poles of the closed-loop transfer function in the closed right-half of the complex plane is ___________.

A
0
B
1
C
2
D
3
3
GATE ECE 2016 Set 2
MCQ (Single Correct Answer)
+1
-0.3
The number and direction of encirclements around the point −1 + j0 in the complex plane by the Nyquist plot of G(s) =$${{1 - s} \over {4 + 2s}}$$ is
A
zero
B
one, anti-clockwise
C
one, clockwise
D
two, clockwise
4
GATE ECE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
A closed-loop control system is stable if the Nyquist plot of the corresponding open-loop transfer function
A
encircles the s-plane point (−1 + j0) in the counterclockwise direction as many times as the number of right-half s-plane poles.
B
encircles the s-plane point (0 − j1) in the clockwise direction as many times as the number of right-half s-plane poles.
C
encircles the s-plane point (−1 + j0) in the counterclockwise direction as many times as the number of left-half s-plane poles.
D
encircles the s-plane point (−1 + j0) in the counterclockwise direction as many times as the number of right-half s-plane zeros.
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