Control Systems - GATE practice papers - Electronics & Communication for Q. 501
Q. What action should be performed in accordance to the rule of signal flow theory, if the summing point is located after the take-off point in the direction of signal flow? (Marks : 02)- Published on 19 Oct 15a. Only Summing Point should be represented by a single node
b. Only Summing Point should be represented by separate node
c. Summing & Take-off Points should be represented by a single node
d. Summing & Take-off Points should be represented by separate nodes
ANSWER: Summing & Take-off Points should be represented by separate nodes
According to the construction rule of signal flow graph, all summing & take-off points are absolutely represented by nodes.
Therefore, a single node is sufficient to represent the summing and take-off points,if the position of summing point is before the take-off point.
But, if the position of summing point lies after the take-off point, then both of them are represented with the assistance of separate nodes connected by a branch possessing unit value of transmittances.
