Electronics and Communication Engineering - Exam Questions Papers - Discussion

3. 

An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8
where K is the forward gain of the system. The condition for closed loop stability is

[A]. K = 0.528
[B]. K = 2
[C]. K = 0
[D]. K = -2528

Answer: Option A

Explanation:

s3 + 6ks2 + (k + 2)s + 8 = 0

a0 = 1, a1 = 6k, a2 = k + 2, a3 = 8

Apply R.H. criteria.


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