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Exam Questions Papers - Engineering

Q1:

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

ANS:D - 44/23

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 .