Control Systems - GATE practice papers - Electronics & Communication for Q. 499
Q. Which among the below specified block reduction techniques deal with an algebraic addition of block for the evaluation of transfer function? (Marks : 01)- Published on 19 Oct 15a. Associative Law
b. Blocks in Series
c. Blocks in Parallel
d. Summing Point Shift (behind the block)
ANSWER: Blocks in Parallel
According to the drawing procedure of block diagram, sequential block reduction priorities are assigned for those connected in series , parallel,minor feedback loops and then summing point shift.
However, the transfer function of the serially connected blocks is evaluated on the basis of multiplication while the transfer function of the blocks connected in parallel combination is evaluated on the basis of an algebraic addition.
Associative law is only applicable when two or more directly connected summing points are interchangeable.
