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Control SystemsRoot Locus

A breakaway or break-in point on the real-axis root locus can be found from the gain expression K(s) by solving?

  • AdK/ds=0
  • BK=0 only
  • Cd²K/ds²=0 only
  • Ds=0 always
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Correct Answer: A. dK/ds=0
Explanation: Candidate real-axis break points are obtained from dK/ds=0 and then checked for validity on the root locus.
Reference: Standard control systems: root locus
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