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# Stability Theory – 6

6. The characteristic equation 1 + G(s) R(s) = 0 of a system is given by

$s^4 + 6s^3 + 11s^2 + 6s + K = 0$

For the system to remain stable, the value of gain K should be :

(a) zero
(b) greater than zero but less than 10
(c) greater than 10 but less than 20
(d) greater than 20 but less than 30

Answer : (b)

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