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Control SystemsNyquist Stability

The Nyquist stability criterion is based on encirclements of which critical point in the loop-transfer plane?

  • A0+j0
  • B+1+j0
  • C-1+j0
  • Dj∞
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Correct Answer: C. -1+j0
Explanation: For the usual negative-feedback formulation, the critical point is -1+j0.
Reference: Standard control systems: nyquist stability
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