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GATE ECE 2007 | Question: 53

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The transfer function of a plant is $T(s)=\dfrac{5}{(s+5)\left(s^{2}+s+1\right)}$. The second-order approximation of $T(s)$ using dominant pole concept is

  1. $\frac{1}{(s+5)(s+1)}$
  2. $\frac{5}{(s+5)(s+1)}$
  3. $\frac{5}{s^{2}+s+1}$
  4. $\frac{1}{s^{2}+s+1}$

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