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Q1:

Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be given by

A 1 : (1 + GH)

B 1 : (1 + GH)- 1

C 1 : (1 - GH)

D 1 : (1 - GH)- 1

ANS:B - 1 : (1 + GH)- 1

Open loop sensitivity = 1 Closed loop sensitivity = Hence ratio = 1 : (1 + GH) - 1.



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