Multiple choice

The open-loop transfer function of a unity feedback system is

G(s) $\dfrac{K}{s(s^2+s+2)(s+3)}$

The range of K for which the system is stable is

  1. $\dfrac{21}{4} > K > 0$

  2. 13 > K > 0
  3. $\dfrac{21}{4}$< K < $\infty$
  4. – 6 < K < $\infty$
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