40. The open-loop transfer function of a unity feedback control system is G(s)H(s) = 225/(S( s+2)(s +T)) Where T is a variable parameter The closed-loop system will be stable for all values of
(a)T > 0 (b)0 < K < 00 (c)>11 (d)positive
Answer
Answer : (c)
Explanation
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Stability Theory » Exercise - 142. The open-loop transfer function of a control system is given by G(s) = (K(s+8))/(S( s+4)(s+a)) The smallest possible value of a for which the system is stable in the closed-loop for all positive value of K is : (a) 0 (b) 4 (c) 8 (d) 12
Stability Theory » Exercise - 130. The characteristic equation 1 + G(s)H(s) = 0 of a system is given by s4 + 8s3 +12s2 +8s + K = 0 For the system to remain stable, the value of gain K should be : (a) zero (b) 0< K (c) >11 (d) positives
Stability Theory » Exercise - 145. Because of the addition of a zero to G(s)H(s), the stability of the system is : (a) improved (b) reduced (c) not affected (d) none of these
Stability Theory » Exercise - 15. The characteristic equation of a feedback control system is The number of roots in the right half of s-plane are : (a) zero (b) 1 (c) 2 (d) 3
Stability Theory » Exercise - 117. The open-loop transfer function of a control system has 5 poles and 3 zeros. The number of asymptotes is equal to : (a) 5 (b) 3 (c) 2 (d) 8