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For the gain feedback system, does not affect the system output if KG is :

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For the gain feedback system, does not affect the system output if KG is :

(a) Small

(b) Negative

(c) One

(d) Very large

The question was asked in unit test.

This intriguing question comes from Feedback Compensation in portion Design of Control Systems

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The correct option is (d) Very large

For explanation I would say: T(s)=KG/(1+KGH)

 If KG>>1: then C(s)=R(s)/H.

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