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Hot questions in Control Systems
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1
GATE2014244
A system with the open loop transfer function $G(s)=\frac{K}{s(s+2)(s^2+2s+2)}$ is connected in a negative feedback configuration with a feedback gain of unity. For the closed loop system to be marginally stable, the value of $K$ is ______
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
negativefeedback
marginallystable
numericalanswers
0
votes
0
answers
2
GATE2014118
The root locus of a unity feedback system is shown in the figure The closed loop transfer function of the system is $\frac{C(s)}{R(s)}=\frac{K}{(s+1)(s+2)}$ $\frac{C(s)}{R(s)}=\frac{K}{(s+1)(s+2)+K}$ $\frac{C(s)}{R(s)}=\frac{K}{(s+1)(s+2)K}$ $\frac{C(s)}{R(s)}=\frac{K}{(s+1)(s+2)+K}$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
stability
bodeplot
0
votes
0
answers
3
GATE2014318
A singleinput singleoutput feedback system has forward transfer function $G(s)$ and feedback transfer function $H(s)$. It is given that $G(s)H(s)< 1$ . Which of the following is true about the stability of the system? The system is always stable The ... are in left half of the splane It is not possible to say whether or not the system is stable from the information given
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee3
transferfunction
feedbacksystem
0
votes
0
answers
4
GATE2014217
The closed loop transfer function of a system is $T(s)=\frac{4}{s^2+0.4S+4}$ The steady state error due to unit step input is __________.
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
unitstepfunction
closedloopsystem
numericalanswers
0
votes
0
answers
5
GATE2014346
The magnitude Bode plot of a network is shown in the figure The maximum phase angle $\phi _m$ and the corresponding gain $G_m$ respectively, are $30^{\circ}$ and $1.73$ $dB$ $30^{\circ}$ and $477$ $dB$ $+30^{\circ}$ and $4.77$ $dB$ $+30^{\circ}$ and $1.73$ $dB$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee3
bodeplot
stability
0
votes
0
answers
6
GATE2015153
The transfer function of a second order real system with a perfectly flat magnitude response of unity has a pole at $(2 − j3)$. List all the poles and zeroes. Poles at $(2 \pm j3)$, no zeroes. Poles at $(\pm 2 − j3)$, one zero at origin. Poles at $(2 − j3)$, $(−2 + j3)$, zeroes at $(−2 − j3)$, $(2 + j3)$. Poles at $(2 \pm j3)$, zeroes at $(−2 \pm j3)$.
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee1
secondorderrealsystem
poles
zeroes
0
votes
0
answers
7
GATE2015155
The open loop poles of a third order unity feedback system are at $0, −1, −2$. Let the frequency corresponding to the point where the root locus of the system transits to unstable region be $K$. Now suppose we introduce a zero in the open loop ... corresponds to a frequency less than $K$ It corresponds to a frequency $K$ Root locus of modified system never transits to unstable region
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee1
rootlocus
unityfeedbacksystem
0
votes
0
answers
8
GATE2014233
A discrete system is represented by the difference equation $\begin{bmatrix} X_1(k+1)\\ X_2(k+2) \end{bmatrix}=\begin{bmatrix} a & a1\\ a+1 & a \end{bmatrix}\begin{bmatrix} X_1(k)\\X_2(k) \end{bmatrix}$ It has initial conditions $X_1(0)$ = $1$; $X_2(0)$ = $0$. The pole locations of the system for $a$ = $1$, are $1\pm j0$ $1\pm j0$ $\pm 1+j0$ $0\pm j1$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
bodeplot
stabilitystudy
0
votes
0
answers
9
GATE2014144
For the given system, it is desired that the system be stable. The minimum value of $\alpha$ for this condition is ____________. .
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
feedbacksystem
stability
numericalanswers
0
votes
0
answers
10
GATE2014317
The signal flow graph of a system is shown below. $U(s)$ is the input and $C(s)$ is the output. Assuming, $h_1=b_1$ and $h_0=b_0b_1a_1$ , the inputoutput transfer function, $G(s)=\frac{C(s)}{U(s)}$ of the system is given by $G(s)=\frac{b_0s+b_1}{s^2+a_0s+a_1} \\ $ $G(s)=\frac{a_1s+a_0}{s^2+b_1s+b_0} \\ $ $G(s)=\frac{b_1s+b_0}{s^2+a_1s+a_0} \\$ $G(s)=\frac{a_0s+a1}{s^2+b_0s+b_1}$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee3
stability
bodeplot
0
votes
0
answers
11
GATE201340
The signal flow graph for a system is given below. The transfer function $\dfrac{Y(s)}{U(s)}$ for this system is $\dfrac{s+1}{5s^2+6s+2}$ $\dfrac{s+1}{s^2+6s+2}$ $\dfrac{s+1}{s^2+4s+2}$ $\dfrac{1}{5s^2+6s+2}$
asked
Feb 12, 2017
in
Control Systems
by
piyag476
(
1.5k
points)
gate2013ee
controllers
stability
0
votes
0
answers
12
GATE201429
Consider an LTI system with transfer function $H(s)=\frac{1}{s(s+4)}$ If the input to the system is $cos(3t)$ and the steady state output is $Asin(3t+\alpha )$ , then the value of $A$ is $1/30$ $1/15$ $3/4$ $4/3$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
lineartimeinvariantsystem
transferfunction
0
votes
0
answers
13
GATE2014151
In the figure shown, assume the opamp to be ideal. Which of the alternatives gives the correct Bode plots for the transfer function $\dfrac{V_o(\omega )}{V_i(\omega )}?$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee1
transfer
function
operationalamplifier
0
votes
0
answers
14
GATE2015124
A Bode magnitude plot for the transfer function $G(s)$ of a plant is shown in the figure. Which one of the following transfer functions best describes the plant? $\frac{1000(s+10)}{s+1000}$ $\frac{10(s+10)}{s(s+1000)}$ $\frac{s+1000}{10s(s+10)}$ $\frac{s+1000}{10(s+10)}$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee1
bodeplot
stability
0
votes
0
answers
15
GATE201315
The Bode plot of a transfer function $G(s)$ is shown in the figure below. The gain $\big(20 \log\mid G(s) \mid \big)$ is $32 dB$ and $8 dB$ at $1$ rad/s and $10$ rad/s respectively. The phase is negative for all $\omega$. Then $G(s)$ is $\frac{39.8}{s} \\$ $\frac{39.8}{s^2} \\$ $\frac{32}{s} \\$ $\frac{32}{s^2}$
asked
Feb 12, 2017
in
Control Systems
by
piyag476
(
1.5k
points)
gate2013ee
gain
stability
0
votes
0
answers
16
GATE2014245
For the transfer function $G(s)=\frac{5(s+2)}{s(s+0.25)(s^2+4s+25)}$ The values of the constant gain term and the highest corner frequency of the Bode plot respectively are $3.2$ , $5.0$ $16.0$ , $4.0$ $3.2$ , $4.0$ $16.0$ , $5.0$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2014ee2
transferfunction
gain
bodeplot
0
votes
0
answers
17
GATE2015211
The operational amplifier shown in the figure is ideal. The input voltage (in Volt) is $V_{i} = 2 \sin(2\pi × 2000t)$. The amplitude of the output voltage $V_{0}$ (in Volt) is ________.
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee2
operationalamplifier
pidcontroller
numericalanswers
0
votes
0
answers
18
GATE2015224
An open loop control system results in a response of $e^{2t}(\sin 5t+\cos 5t)$ for a unit impulse input. The $DC$ gain of the control system is ________.
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee2
openloopsystem
independantsystem
numericalanswers
0
votes
0
answers
19
GATE2015113
Consider the circuit shown in the figure. In this circuit $R=1 k\Omega$, and $C=1 \mu F$. The input voltage is sinusoidal with a frequency of $50$ Hz, represented as a phasor with magnitude $V_{i}$ and phase angle $0$ radian as shown in the figure. The output voltage is ... $0$ $\pi$ $\frac{\pi}{2}$ $\frac{\pi}{2}$
asked
Feb 12, 2017
in
Control Systems
by
makhdoom ghaya
(
9.2k
points)
gate2015ee1
operationalamplifier
feedbacksystem
0
votes
0
answers
20
GATE201328
The openloop transfer function of a dc motor is given as $\dfrac{\omega (s)}{V_a(s)}=\dfrac{10}{1+10s}$.When connected in feedback as shown below, the approximate value of $K_a$ that will reduce the time constant of the closed loop system by one hundred times as compared to that of the openloop system is $1$ $5$ $10$ $100$
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Feb 12, 2017
in
Control Systems
by
piyag476
(
1.5k
points)
gate2013ee
feedbacksystem
closedloopsystem
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