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  1. For signal flow graph shown in following figure determine the ratio X5|X1. Use Mason's gain formula for signal flow graph.

    2. A.
    B.
    C.
    D.
    None of these

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    Answer : Option A

    Explanation :

    Number of forward paths K = 3

    T1 = G1G2G3G4

    T2 = G1G6G4

    T3 = G1G7

    Number of loops

    L1 = G2H1

    L2= G5

    Δ = 1 - [L1 + L2] + [L1 L2]

    = 1 - [G2H1 + G5] + [G2G5H1]

    .

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