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Control SystemsStability Margins

The phase crossover frequency is the frequency at which open-loop phase is?

  • A0°
  • B+90°
  • C-90°
  • D-180° modulo 360°
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Correct Answer: D. -180° modulo 360°
Explanation: Phase crossover is conventionally where loop phase reaches -180° (modulo 360°).
Reference: Standard control systems: stability margins
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