EC > GATE 2015 SET-2 > Control Systems
For the signal flow graph shown in the figure, the value of C(s)R(s) is
A
(A) G1G2G3G41−G1G2H1−G3G4H2−G2G3H3+G1G2G3G4H1H2
B
(B) G1G2G3G41+G1G2H1+G3G4H2+G2G3H3+G1G2G3G4H1H2
C
(C) 11+G1G2H1+G3G4H2+G2G3H3+G1G2G3G4H1H2
D
(D) 11−G1G2H1−G3G4H2−G2G3H3+G1G2G3G4H1H2

Correct : b

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