1.

Effect of feedback on sensitivity is minimum in:(a) Open loop control system(b) Closed loop control system(c) None of the mentioned(d) Both of the mentionedThe question was posed to me in an online interview.My enquiry is from Feedback and Non-feedback Systems topic in portion Feedback Characteristics of Control Systems of Control Systems

Answer»

The correct option is (b) Closed loop CONTROL system

To elaborate: Sensitivity is defined as the change in output with respect to change in parameter or input and for a GOOD control system the sensitivity MUST be less and in closed loop control system it gets REDUCED by the FACTOR of 1/(1+GH).



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