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For the block diagram given in the following figure, the expression of C/R is:

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For the block diagram given in the following figure, the expression of C/R is:

(a) G1G2G3/1-G2G1

(b) G1G2/1-G1G2G3

(c) G1G2G3/1-G1G2G3

(d) G1G2/G3(1-G1G2)

The question was asked in an online interview.

This question is from Block diagram Algebra topic in chapter Mathematical Models of Physical Systems of Control Systems

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Right option is (a) G1G2G3/1-G2G1

Easy explanation: Block diagram is being converted into signal flow graphs by considering each take off point as a node and each forward transfer function as forward gain.

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