1
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
If $$s^3+\;3s^2\;+\;4s\;+A\;=\;0$$ ,then all the roots of this equation are in the left half plane provided that
A
A > 12
B
-3 < A < 4
C
0 < A < 12
D
5 < A < 12
2
GATE ECE 1990
MCQ (Single Correct Answer)
+2
-0.6
An electromechanical closed-loop control system has the following characteristic equation $$s^3+6Ks^2+\left(K+2\right)s+8\;=\;0$$, 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 = -2.258
3
GATE ECE 1989
MCQ (Single Correct Answer)
+2
-0.6
In order to stabilize the system shown in fig. Ti should satisfy: GATE ECE 1989 Control Systems - Stability Question 17 English
A
$${\mathrm T}_\mathrm i=-\mathrm T$$
B
$${\mathrm T}_\mathrm i=\mathrm T.$$
C
$${\mathrm T}_\mathrm i<\mathrm T.$$
D
$${\mathrm T}_\mathrm i>\mathrm T.$$
4
GATE ECE 1988
MCQ (Single Correct Answer)
+2
-0.6
Consider a characteristic equation given by
s4 + 3s3 + 5s2 + 6s + K + 10 = 0.
The condition for stability is
A
K > 5
B
-10 < K
C
K > -4
D
-10 < K < -4
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