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The effect of adding feedback makes the system__________(a) Linear(b) Non-linear(c) Time variant(d) Time invariantThis question was posed to me in exam.Question is taken from Linearizing Effect and Regenerative Feedback topic in section Feedback Characteristics of Control Systems of Control Systems

Answer»

Correct choice is (a) Linear

Easy explanation: Consider the single loop system with FORWARD path TRANSFER function as the square function then the RESPONSE GENERATED is nonlinear if system is OPEN loop but will be approximately linear if closed loop.



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