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The price for improvement in sensitivity by the use of feedback is paid in terms of

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  1. loss of system gain
  2. rise of system gain
  3. improvement in transient response, delayed response
  4. poor transient response

Answer (Detailed Solution Below)

Option 1 : loss of system gain
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Detailed Solution

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Concept:

Sensitivity is the relative variation in one parameter with respect to the other parameters i.e.

 : the sensitivity of variable A with respect to parameter K.

It is preferable that the sensitivity function  to be minimum.

Analysis:

The closed-loop transfer function is given by:

And the Open-loop transfer function T2(s) = G(s)

Clearly, T2(s) > T1(s)

Hence, with the use of feedback, the overall Transfer function G(s) is reduced by  times.

∴ There is a loss of system gain that happens.

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