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  1. The signal flow graph of a system is shown in figure. The transfer function of the system is :

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    Answer : Option D

    Explanation :

    P1 = 1 [Path R(s to C(s)]

    Δ = 1 - (L1 - L2 + L3) + L1L2

    P1 = 1; Δ1 = 1

    [Non touching loop gain to forward path]

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