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Automatic Control Systems

Q1:
Given figure shows the magnitude plot for a system. The steady state error for unit step input is

A 1/101

B 1/100

C 1/41

D 1/40

ANS:C - 1/41

But here low-frequency line is not interesting at 40 db, it is interesting somewhere else above 40 db.

So, K can be calculated by another method,
20log(k) = 40
K = Kp = 100,
Ess = 1/(1+100) = 1/101
The Answer should be option A.



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