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The overall transfer function from block diagram reduction for cascaded blocks is :

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The overall transfer function from block diagram reduction for cascaded blocks is :

(a) Sum of individual gain

(b) Product of individual gain

(c) Difference of individual gain

(d) Division of individual gain

The question was posed to me in an internship interview.

Query is from Block diagram Algebra in chapter Mathematical Models of Physical Systems of Control Systems

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The correct choice is (b) Product of individual gain

To explain I would say: Gain of block get multiplied when they are cascaded where cascaded means that the blocks are in series combination with no summer in between.

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