Question

In the signal flow graph of figure, y/x equals

• A. $3$
• B. $5/2$
• C. $2$
• D. None of the above

Answer 1

The correct option is C $2$

$\frac{C}{R}=\frac{\sum P_k{\Delta }_k}{\Delta }$

$\frac{C}{R}=\frac{5\times 2\times 1}{1-(-4)}=\frac{10}{1+4}=\frac{10}{5}=2$