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The Nyquist locus of a transfer function
G(s) H(s) = K 1 + sT1
in given below in figure The locus is modified as shown below in figure, on addition of poles to the original G (s) H (s). Then, the transfer function of the modified locus is—
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G(s) H(s) = K s(1 + sT1) -
G(s) H(s) = K (1 + sT1)(1 + sT2) -
G(s) H(s) = K s(1 + sT1)(1 + sT2)
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G(s) H(s) = K s(1 + sT1)(1 + sT2)(1 + sT3)
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Correct Option: B
From the given Nyquist plot we conclude that both the Nyquist plot have phase = 0° at ω = 0.
and it can be possible only from the modified transfer function given in option (B) only.
Hence alternative (B) is the correct choice
