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Control SystemsSteady-State Error

A unity-feedback system has G(s)=20/[s(s+4)]. Its velocity error constant Kv is?

  • A4
  • B5
  • C20
  • D80
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Correct Answer: B. 5
Explanation: Kv=lim(s→0)sG(s)=20/(s+4)|s=0=5.
Reference: Standard control systems: steady-state error
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