Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 7 (Q.No. 30)
30.
A control system is as shown in given figure The maximum value of gain K for which the system is stable is
Answer: Option
Explanation:
Characteristic Equation is 1 + GH = 0
1 + 
or s3 + 3s2 + 2s + (1 + K) = 0
Hurwitz criterion can be applied
s3 1 2 
and (1 + K) both should be + ve
s2 3 1 + K
s1 
0 ∴ K should be more than - 1 and less than 5
s0 1 + K.
Discussion:
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