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Control systems miscellaneous

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Control systems miscellaneous
  1. The transfer function V(s) /I(s) in the signal flow graph shown in the figure is—


    1. s2
      s2 + s + 1
    2. s2 - s - 1
      s
    3. s
      s + 1/s
    4. s
      s2 + s + 1
Correct Option: A

V(s) = sI(s) – sV(s) – V(s)/s
V(s) [1 + s + 1/s] = sI(s)

V(s)
 =
s
 =
s2
I(s)1 + s +1/ss2 + s + 1


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