A unity feedback control system is shown in the follow·ing diagram.

Unity Feedback Control Sysl.em Determine the relative stability of the system with the following transfer function by locating the complex roots in the s-plane.

(a) .

(b)

(c)

~ 65 + 33s

(,.(s) = s2 (s + 9)

24 G ( s) = --,--,,----:-:,---.,...,----,-

s(s:> + 10s2 + 35s +50)

G(s) = 3(s + 4)(s + 8)

s(s + 5) 2 Problem