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The root locus for K < 0 for the transfer function expressed by G(s) H(s) = K s(s + 1)(s + 3)(s + 4)
roughly drawn as
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- none of these
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Correct Option: B
For K < 0, the asymptotes have angles of 0°, 90°. 180° and 270°. In this case, the real axis portions between ∞ and 0, between – 1 and – 3 and between – 4 and – ∞ are on the root locus. There is only one break-away point located at K = – 2.
