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Control systems miscellaneous
  1. The Nyquist plot given in figure corresponds to the system whose transfer function is—


    1. 1/(s + 1)3
    2. 1/(s + 1)2
    3. (s + 1)/s
    4. 1/s + 1
Correct Option: B

From figure, we see that
at ω = 0 phase = 0°, and
at ω = ∞ phase = – 180°
This situation is possible only in option (B).


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