1
GATE ECE 2001
MCQ (Single Correct Answer)
+1
-0.3
The Nyquist plot for the open-loop transfer function G(s) of a unity negative feedback system is shown in figure. if G(s) has no pole in the right half of s-plane, the number of roots of the system characteristic equation in the right half of s-plane is GATE ECE 2001 Control Systems - Frequency Response Analysis Question 63 English
A
0
B
1
C
2
D
3
2
GATE ECE 1999
MCQ (Single Correct Answer)
+1
-0.3
The gain margin of a system having the loop transfer function G(s)H(s) =$${{\sqrt 2 } \over {s(s + 1)}}$$ is
A
0
B
3
C
6
D
$$\infty $$
3
GATE ECE 1999
MCQ (Single Correct Answer)
+1
-0.3
The phase margin (in degrees) of a system having the loop transfer function is $$G(s)H(s) = {{2\sqrt 3 } \over {s(s + 1)}}$$
A
$$45^\circ $$
B
$$-30^\circ $$
C
$$60^\circ $$
D
$$30^\circ $$
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
In the Bode-plot of a unity feedback control system, the value of phase of G($$j\omega $$) at the gain cross over frequency is $$ - 125^\circ $$. The phase margin of the system is
A
$$ - 125^\circ $$
B
$$ - 55^\circ $$
C
$$ 55^\circ $$
D
$$ 125^\circ $$
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