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The signal flow graph of a closed loop system is shown in the figure, where represents the disturbance in the forward path. The effect of the disturbance can be reduced by
  • a)
    Increasing
  • b)
    Decreasing
  • c)
    Increasing
  • d)
    Decreasing
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The signal flow graph of a closed loop system is shown in the figure, ...
With feedback, the output due to disturbance

Without feedback output due to disturbance is

By comparing above two equations, feedback decreases the effect of noise.If Increases, disturbance decreases, But gain also decreases. This is not desirable.
If increases, disturbance increases, since noise links with 
if increases, disturbance decreases, and gain also decreases. This is desirable.
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The signal flow graph of a closed loop system is shown in the figure, where represents the disturbance in the forward path. The effect of the disturbance can be reduced by a)Increasing b)Decreasing c)Increasing d)Decreasing Correct answer is option 'C'. Can you explain this answer?
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