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Control SystemsSteady-State Error

For a Type 0 unity-feedback system, the steady-state error to a unit-step input is generally?

  • AZero
  • BFinite and nonzero
  • CInfinite in every case
  • DAlways -1
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Correct Answer: B. Finite and nonzero
Explanation: A Type 0 system has finite position error constant Kp, so for a unit step ess=1/(1+Kp), generally finite and nonzero.
Reference: Standard control systems: steady-state error
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