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GATE ECE 2009 | Question-53

Common Data for Questions 53 and 54:

The Nyquist plot of a stable transfer function $G(s)$ is shown in the figure. We are interested in the stability of the closed loop system in the feedback configuration shown.

Which of the following statements is true?

  1. $G(s)$ is an all-pass filter
  2. $G(s)$ has a zero in the right-half plane
  3. $G(s)$ is the impedance of a passive network
  4. $G(s)$ is marginally stable
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