For s²+6s+25=0, the damping ratio ζ is?

  • A0.3
  • B0.6
  • C1.0
  • D1.2
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Correct Answer: B. 0.6
Explanation: 2ζωn=6 and ωn=5, hence ζ=6/(2×5)=0.6.
Reference: Standard control systems: second-order systems
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