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GATE ECE 2006 | Question: 55

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The Nyquist plot of $\mathrm{G}(j \omega) \mathrm{H}(j \omega)$ for a closed loop control system, passes through $(-1, j 0)$ point in the $\mathrm{GH}$ plane. The gain margin of the system in $\mathrm{dB}$ is equal to

  1. infinite
  2. greater than zero.
  3. less than zero
  4. zero

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