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Control SystemsTime Response

A first-order system is commonly considered essentially settled to within about 2% after approximately?

  • AT
  • B2T
  • C4T
  • D10T
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Correct Answer: C. 4T
Explanation: For a standard first-order response, e^-4≈0.0183, so about 4 time constants corresponds to the 2% settling criterion.
Reference: Standard control systems: time response
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