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Control SystemsRoot Locus

For the same system with three poles and no finite zeros, the asymptote angles are?

  • A0°, 120°, 240°
  • B60°, 180°, 300°
  • C90°, 180°, 270°
  • D45°, 180°, 315°
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Correct Answer: B. 60°, 180°, 300°
Explanation: With n-m=3, θq=(2q+1)180°/3 gives 60°, 180° and 300°.
Reference: Standard control systems: root locus
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