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Control SystemsRoot Locus

On a real-axis segment, a point belongs to the conventional positive-gain root locus if the number of real open-loop poles and zeros to its right is?

  • AEven
  • BOdd
  • CZero only
  • DAlways two
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Correct Answer: B. Odd
Explanation: For K≥0, a real-axis point lies on the root locus when the total number of real poles and zeros to its right is odd.
Reference: Standard control systems: root locus
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