ISRO Electrical Engineering (EE) 2018 - Question 4

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For the step response C(s) = 10(s - 2) / (s(s^2 + 4s + 5)) find initial and final value of C(s).

  • A. Initial value = 0, Final value = 0
  • B. Initial value = 0, Final value = -4
  • C. Initial value = 0, Final value = cannot determine
  • D. Initial value = cannot determine, Final value = 0

Answer: B. Initial value = 0, Final value = -4

Explanation: Initial value = lim s·C(s) as s→∞ = 0; final value = lim s→0 s·C(s) = 10(−2)/5 = −4 (poles at −2±j are stable in LHP).

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