[Solved] Signal flow graphs:

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Q.	Signal flow graphs:
A.	they apply to linear systems
B.	the equation obtained may or may not be in the form of cause or effect
C.	arrows are not important in the graph
D.	they cannot be converted back to block diagram
Answer» A. they apply to linear systems
Explanation: signal flow graphs are used to find the transfer function of control system by converting the block diagrams into signal flow graphs or directly but cannot be used for nonlinear systems.

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