1
GATE EE 2000
Subjective
+5
-0
Open-loop transfer function of a unity - feedback system is
$$$G\left( s \right) = {G_1}\left( s \right).{e^{ - s{\tau _D}}} = {{{e^{ - s{\tau _D}}}} \over {s\left( {s + 1} \right)\left( {s + 2} \right)}}$$$
Given : $$\,\left| {{G_1}\left( {j\omega } \right)} \right| \approx 1$$ when $$\omega = 0.446$$
Given : $$\,\left| {{G_1}\left( {j\omega } \right)} \right| \approx 1$$ when $$\omega = 0.446$$
(a) Determine the phase margin when $${\tau _D} = 0$$
(b) Comment in one sentence on the effect of dead time on the stability of the system.
(c) Determine the maximum value of dead time $${\tau _D}$$ for the closed-loop system to be stable.
2
GATE EE 1998
Subjective
+5
-0
The asymptotic magnitude Body plot of a system is given in Figure. Find the transfer function of the system analytically. It is known that the system is minimal phase system.
![GATE EE 1998 Control Systems - Polar Nyquist and Bode Plot Question 19 English](https://gateclass.static.cdn.examgoal.net/6DbwNcdRWV2kZq14E/5b3BceJbrwcXUWWuKMKQoL3Ujojwf/Wd1WKgemFxuIW7eyAkiCyV/uploadfile.jpg)
Questions Asked from Polar Nyquist and Bode Plot (Marks 5)
Number in Brackets after Paper Indicates No. of Questions
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits