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Exam Questions Papers - Engineering

Q1:

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

A

B

C

D None of these

ANS:A -

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] .