Discussion :: Exam Questions Paper
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In the signal flow graph of figure below, the gain C/R will be :
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Answer : Option D
Explanation :
Forward path gain
P1 = 2 x 3 x 4 ⇒ 24, P2 = 5, D1 = 1
D2 = - 3, L1 = - 2, L2 = - 3, L3 = - 4
Two non touching loop = L1 x L3 = - 2 x - 4 = 8
But if we take loop L4 into consideration then = 5 x -1 x - 1 x - 1 = -5
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