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The open loop transfer function of a unity gain negative feedback control system is given by G(s) = (s2 + 4s + 8)/[s(s + 2)(s + 8)]. The angle θ , at which the root locus approaches the zeros of the system,
satisfies
Options:
A .  |θ| = Ï€ - tan-1 (1/4)
B .  |θ| = 3Ï€/4 - tan-1 (1/3)
C .  |θ| = Ï€/2 - tan-1 (1/4)
D .  |θ| = Ï€/4 - tan-1 (1/3)
Answer: Option D


-NA-



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