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The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is
  • a)
    Zero
  • b)
    -1dB
  • c)
    1dB
  • d)
    Infinity
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The polar plot of a transfer function passes through the critical poin...
  • The gain margin of a transfer function is a measure of how much the gain of the system can be increased before it becomes unstable. In a polar plot, the critical point (-1,0) corresponds to a frequency where the phase angle is -180 degrees (or pi radians).
  • In this case, the polar plot passing through the critical point (-1,0) indicates that the phase margin is zero. The gain margin is related to the phase margin, and when the phase margin is zero, the gain margin is also zero.
  • Therefore, the correct answer is: A: Zero
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The polar plot of a transfer function passes through the critical point (-1,0). Gain margin isa)Zerob)-1dBc)1dBd)InfinityCorrect answer is option 'A'. Can you explain this answer?
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