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Automatic Control Systems - Engineering

Q1:

For the signal flow graph of the given figure consider the following statements
  1. It has three forward paths
  2. It has three individual loops
  3. It has two non touching loops
Out of above the correct statements are

A 1, 2, 3

B 1, 2

C 2, 3

D 1, 3

ANS:D - 1, 3

x5 have a self loop so forward, in between x2 and x3 one forward loop. Similarly x3 to x4 another, x2 to x4 and x2 to x5 are two non touching loops there.