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Signal flow graphs:

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in Control Systems by (105k points)
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

This question was posed to me in an international level competition.

I would like to ask this question from Signal Flow Graphs topic in section Mathematical Models of Physical Systems of Control Systems

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The correct option is (a) They apply to linear systems

Easiest 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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