1
GATE ECE 1998
Subjective
+5
-0
The characteristic equation of a feedback control system is
$$$s^4+20s^3+15s^2+2s+K\;=\;0$$$
(i) Determine the range of K for the system to be stable.
(ii) Can the system be marginally stable? If so, find the required value of K and the frequency of sustained oscillation.
(i) Determine the range of K for the system to be stable.
(ii) Can the system be marginally stable? If so, find the required value of K and the frequency of sustained oscillation.
2
GATE ECE 1996
Subjective
+5
-0
A system having an open loop transfer function
$$G\left(s\right)=\frac{K\left(s+3\right)}{s\left(s^2+2s+2\right)}$$
is used in a
control system with unity negative feedback. Using the Routh-Hurwitz criterion,
find the range of values of 'K' for which the feedback system is stable.
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