Multiple choice

Directions: Carry One Mark Each.

For the signal flow graph shown in the figure, the value of $\frac{C(s)}{R(s)}$ is

  1. $\frac{1}{1 - G_1G_2H_1 - G_3G_4H_2 - G_2G_3H_3 + G_1G_2G_3G_4H_1H_2}$
  2. $\frac{G_1G_2G_3G_4}{1 + G_1G_2H_1 + G_3G_4H_2 + G_2G_3H_3 + G_1G_2G_3G_4H_1H_2}$
  3. $\frac{1}{1 + G_1G_2H_1 + G_3G_4H_2 + G_2G_3H_3 + G_1G_2G_3G_4H_1H_2}$
  4. $\frac{1}{1 - G_1G_2H_1 - G_3G_4H_2 - G_2G_3H_3 + G_1G_2G_3G_4H_1H_2}$
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B Correct answer
Explanation

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