Electronics and Communication Engineering - Exam Questions Papers - Discussion

1. 

In the signal flow graph of figure below, the gain C/R will be :

[A]. 11/9
[B]. 22/15
[C]. 24/23
[D]. 44/23

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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