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Control SystemsStability Margins

At the phase crossover frequency, |G(jω)H(jω)|=0.5. The gain margin as a ratio is?

  • A0.5
  • B1
  • C2
  • D4
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Correct Answer: C. 2
Explanation: Gain margin GM=1/|GH| at phase crossover=1/0.5=2.
Reference: Standard control systems: stability margins
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