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Control SystemsStability Margins

At the gain crossover frequency, the open-loop phase is -140°. The phase margin is?

  • A20°
  • B40°
  • C140°
  • D320°
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Correct Answer: B. 40°
Explanation: PM=180°+phase at gain crossover=180-140=40°.
Reference: Standard control systems: stability margins
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