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Q1:
The signal flow graph of a system is shown in figure. The transfer function of the system is :

A

B

C

D

ANS:D -

P1 = 1 [Path R(s to C(s)] Δ = 1 - (L1 - L2 + L3) + L1L2 P1 = 1; Δ1 = 1 [Non touching loop gain to forward path] .



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