The signal flow diagram for a certain feedback control system is shown – McqOptions

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1.	The signal flow diagram for a certain feedback control system is shown in the figure.Now consider the following set of equations for the nodes1. x2 = a1x1 + a9x32. x3 = a2x2 + a8x43. x4 = a3x3 + a5x24. x5 = a4x4 + a6x2Which of the following is correct?
A.	1, 2 and 3
B.	1, 3 and 4
C.	2, 3 and 4
D.	1, 2 and 4
Answer» E.

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