Rule :- 1.
block connected in crash guard series can be replaced by a single blog with transfer function equal to product of transfer function of individual block.
Rule :- 2
parallel block can be replaced by a single block with transfer function equal to algebraic sum of transfer function of parallel blocks.
Rule :- 3
To shift the summing point to the left of the block divided the signal and trying the something block by G's.
Rule :- 4
to shift the summing point to the right of the block x the signal entering the summing block by G's.
Rule :- 5
to shift the take off after a block at a block in series with all signal which are taking off from at that point having transfer function as a reciprocal of transfer function of the block beyond which take off point is to be shifted.
Rule :- 6
to shift the take off point behind a block add a block having a transfer function same as that of block beyond which takeoff point is to be shifted in cash card with all block at that take off point.
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