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Use mason’s gain formula to calculate the transfer function of given figure:

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Use mason’s gain formula to calculate the transfer function of given figure:

(a) G1/1+G2H

(b) G1+G2/1+G1H

(c) G2/1+G1H

(d) None of the mentioned

I got this question in final exam.

Enquiry is from Signal Flow Graphs in chapter Mathematical Models of Physical Systems of Control Systems

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Right answer is (b) G1+G2/1+G1H

The best I can explain: Use mason’s gain formula to solve the signal flow graph and by using mason’s gain formula transfer function from signal flow graph can be calculated which relates the forward path gain to the various paths and loops.

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