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Control SystemsRoot Locus

Root-locus branches start, for K=0, at the?

  • AOpen-loop poles
  • BOpen-loop zeros
  • CClosed-loop zeros only
  • DImaginary-axis crossings
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Correct Answer: A. Open-loop poles
Explanation: At zero gain, closed-loop poles coincide with the open-loop poles.
Reference: Standard control systems: root locus
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