Explore topic-wise MCQs in Control System.

This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Control System knowledge and support exam preparation. Choose a topic below to get started.

101.

Let the Laplace transform of a function f(t) which exists for t > 0 be F

A. an ideal impulse (t)
B. an ideal delayed impulse (t )
C. an ideal step function u(t)
D. an ideal delayed step function impulse u(t )
Answer» C. an ideal step function u(t)
Discussion
102.

An open loop system represented by the transfer function G(s) = (s - 1) is (s + 2)(s + 3)

A. stable and of the minimum phase type
B. stable and of the non-minimum phase type
C. unstable and of the minimum phase type
D. unstable and of the non-minimum phase type
Answer» C. unstable and of the minimum phase type
Discussion
103.

The open loop transfer function G(s) of a unity feedback control system is given as,

A. three roots with nearly equal real parts exist on the left half of the s-plane
B. one real root is found on the right half of s-plane
C. the root loci cross the j axis for a finite value of k; k 0
D. three real roots are found on the right half of the s-plane
Answer» B. one real root is found on the right half of s-plane
Discussion
104.

The impulse response of a system is h(t) = t u(t). For an input u(t 1), the output is

A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>t<sup>2</sup></center></td><td rowspan="2"> u(t)</td></tr><tr><td style="text-align: center;">2</td></tr></table>
B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>t(t - 1)</center></td><td rowspan="2"> u(t - 1)</td></tr><tr><td style="text-align: center;">2</td></tr></table>
C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>(t - 1)<sup>2</sup></center></td><td rowspan="2"> u(t - 1)</td></tr><tr><td style="text-align: center;">2</td></tr></table>
D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>(t<sup>2</sup> - 1)</center></td><td rowspan="2"> u(t - 1)</td></tr><tr><td style="text-align: center;">2</td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>(t<sup>2</sup> - 1)</center></td><td rowspan="2"> u(t - 1)</td></tr><tr><td style="text-align: center;">2</td></tr></table>
Discussion
105.

The unit step error coefficient of a system G(s) = 1 (s + 6)(s + 1)

A. 6
B. 5/6
C. 1/6
D. 5
Answer» D. 5
Discussion
106.

In the given system, (Q. 56) if a = 0.1, then steady state error to unity ramp input will be______ .

A. 0.35
B. 35
C. 3.5
D. 350
Answer» B. 35
Discussion
107.

For the transfer function

A. 0.707
B. 707
C. 7.07
D. None of the above
Answer» B. 707
Discussion
108.

For a unit step input, a system with forward path transfer function G(s) = 20 s2

A. 7.2
B. 0.01
C. 0.002
D. 0.2
Answer» E.
Discussion
109.

The transfer function of a system is 101 + s

A. 1 / 11
B. 4 / 7
C. 11 / 7
D. None of the above
Answer» B. 4 / 7
Discussion
110.

The z-transform of a signal is given by c(z) = z 1 (1 - z 4)4(1 - z 1)2

A. 0
B. 1
C. 2
D. 3
Answer» B. 1
Discussion
111.

The open-loop DC gain of a unity negative feedback system with closed-loop transfer function

A. 9 / 4
B. 1 / 9
C. 4 / 5
D. 4 / 9
Answer» E.
Discussion
112.

The transfer function Y(s) / U(s) of a system described by the state equations

A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>0.5</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">(s - 2)</td></tr></table>
B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">(s - 2)</td></tr></table>
C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>0.5</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">(s + 2)</td></tr></table>
D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">(s + 2)</td></tr></table>
Answer» E.
Discussion
113.

A unity-feedback control system has the open-loop transfer function

A. 0
B. 1
C. 2
D. 3
Answer» B. 1
Discussion
114.

In a synchro error detector, the output voltage is proportional to [ (t)]

A. 0
B. 1
C. 2
D. 3
Answer» C. 2
Discussion
115.

Consider a unity feedback system having an open-loop transfer function

A. 0.25
B. 25
C. 5
D. 2.5
Answer» E.
Discussion
116.

The characteristic equation of a feedback system is s

A. 1
B. 2
C. 3
D. 4
Answer» C. 3
Discussion
117.

The gain margin of the transfer function

A. 2 dB
B. 12 dB
C. 16 dB
D. 32 dB
Answer» C. 16 dB
Discussion
118.

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.

A. Poles at (2 j3), no zeroes
B. Poles at ( 2 j3), one zero at origin
C. Poles at (2 j3), ( 2 + j3), zeroes at ( 2 j3), (2 + j3)
D. Poles at (2 j3), zeroes at ( 2 j3)
Answer» E.
Discussion
119.

A single-input single-output feedback system has forward transfer function G(s) and feedback transfer funct i on H (s). It is given that |G(s).H(s)|< 1. Which of the following is true about the stability of the system?

A. The system is always stable
B. The system is stable if all zeros of G(s).H(s) are in left half of the s-plane
C. The system is stable if all poles of G(s).H(s) are in left half of the s-plane
D. It is not possible to say whether or not the system is stable from the information given
Answer» B. The system is stable if all zeros of G(s).H(s) are in left half of the s-plane
Discussion
120.

The second order dynamic system

A. Controllable and observable
B. Not controllable but observable
C. Controllable but not observable
D. Not controllable and not observable
Answer» D. Not controllable and not observable
Discussion
121.

The state transition matrix for the system

A. <table><tr><td rowspan="2"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>e<sup>t</sup></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"></td></tr><tr><td>e<sup>t</sup></td><td></td><td></td><td><center>e<sup>t</sup></center></td></tr></table>
B. <table><tr><td rowspan="2"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>e<sup>t</sup></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"></td></tr><tr><td>t<sup>2</sup> e<sup>t</sup></td><td></td><td></td><td><center>e<sup>t</sup></center></td></tr></table>
C. <table><tr><td rowspan="2"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>e<sup>t</sup></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"></td></tr><tr><td>t e<sup>t</sup></td><td></td><td></td><td><center>e<sup>t</sup></center></td></tr></table>
D. <table><tr><td rowspan="2"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>e<sup>t</sup></td><td></td><td> </td><td><center>t e<sup>t</sup></center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"></td></tr><tr><td>0</td><td></td><td></td><td><center>e<sup>t</sup></center></td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>e<sup>t</sup></td><td></td><td> </td><td><center>t e<sup>t</sup></center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"></td></tr><tr><td>0</td><td></td><td></td><td><center>e<sup>t</sup></center></td></tr></table>
Discussion
122.

An open loop transfer function G(s) of a system is

A. 0.42
B. 1.58
C. 0.42 and 1.58
D. None of the above
Answer» B. 1.58
Discussion
123.

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 transfer function at 3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?

A. It corresponds to a frequency greater than K
B. It corresponds to a frequency less than K
C. It corresponds to a frequency K
D. Root locus of modified system never transits
Answer» E.
Discussion
124.

The value of k for a unity feedback system with G(s) = k s(1 + s)

A. 53
B. 0.53
C. 5.3
D. None of the above
Answer» C. 5.3
Discussion
125.

A phase-lead compensator has the transfer function ______ rad/sec

A. 50
B. 5
C. 125
D. 150
Answer» B. 5
Discussion
126.

A plant has the following transfer function :

A. 4 sec
B. 40 sec
C. 10 sec
D. None of the above
Answer» C. 10 sec
Discussion
127.

Which one of the following systems is completely state controllable?

A. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub> </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> = </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>-1</center></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> + </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>2</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2">u</td></tr><tr><td>x<sub>2</sub> </td><td><center>0</center></td><td></td><td></td><td><center>-2</center></td><td>x<sub>2</sub></td><td>1</td></tr></table>
B. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub> </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> = </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>-1</center></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> + </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>2</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2">u</td></tr><tr><td>x<sub>2</sub> </td><td><center>0</center></td><td></td><td></td><td><center>-2</center></td><td>x<sub>2</sub></td><td>0</td></tr></table>
C. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub> </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> = </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>1</center></td><td></td><td> </td><td><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> + </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>1</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2">u</td></tr><tr><td>x<sub>2</sub> </td><td><center>0</center></td><td></td><td></td><td><center>-1</center></td><td>x<sub>2</sub></td><td>0</td></tr></table>
D. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub> </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> = </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>0</center></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> + </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>2</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2">u</td></tr><tr><td>x<sub>2</sub> </td><td><center>2</center></td><td></td><td></td><td><center>-2</center></td><td>x<sub>2</sub></td><td>2</td></tr></table>
Answer» B. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub> </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> = </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>-1</center></td><td></td><td> </td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>x<sub>1</sub></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2"> + </td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>2</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td><td rowspan="2">u</td></tr><tr><td>x<sub>2</sub> </td><td><center>0</center></td><td></td><td></td><td><center>-2</center></td><td>x<sub>2</sub></td><td>0</td></tr></table>
Discussion
128.

Consider the following statements regarding a linear system y = f(x

A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 3 alone is correct
D. 1 and 3 are correct
Answer» E.
Discussion
129.

A system is described by the state equation

A. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>e<sup>2t</sup></center></td><td></td><td></td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>1</td><td></td><td></td><td>e<sup>2t</sup></td></tr></table>
B. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>e<sup>-2t</sup></center></td><td></td><td></td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>0</td><td></td><td></td><td>e<sup>-t</sup></td></tr></table>
C. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>e<sup>2t</sup></center></td><td></td><td></td><td><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>1</td><td></td><td></td><td>e<sup>2t</sup></td></tr></table>
D. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>e<sup>-2t</sup></center></td><td></td><td></td><td><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>1</td><td></td><td></td><td>e<sup>-t</sup></td></tr></table>
Answer» B. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td><center>e<sup>-2t</sup></center></td><td></td><td></td><td><center>0</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>0</td><td></td><td></td><td>e<sup>-t</sup></td></tr></table>
Discussion
130.

State representation of a second order system is

A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 2 and 3 are correct
D. 1 and 3 are correct
Answer» D. 1 and 3 are correct
Discussion
131.

Consider the following properties attributed to state model of a system :

A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 2 and 3 are correct
D. 1 and 3 are correct
Answer» D. 1 and 3 are correct
Discussion
132.

Given a system represented by equations

A. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 5s + 2</td></tr></table>
B. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 2</td></tr></table>
C. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 2</td></tr></table>
D. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">s<sup>3</sup> + 2s<sup>2</sup> + 2</td></tr></table>
Answer» C. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 2</td></tr></table>
Discussion
133.

Maximum phase-lead of the compensator

A. 52 deg at 4 rad/sec
B. 52 deg at 10 rad/sec
C. 55 deg at 12 rad/sec
D. none of these
Answer» E.
Discussion
134.

The maximum phase shift that can be obtained by using a lead compensator with transfer function

A. 15
B. 30
C. 45
D. 60
Answer» C. 45
Discussion
135.

The forward-path open-loop transfer function of a unity feedback system is

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-912.jpg">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-913.jpg">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-914.jpg">
D. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-915.jpg">
Answer» C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-914.jpg">
Discussion
136.

The open-loop transfer function of a feedback control system is given by

A. ( 1, 0)
B. ( 2, 0)
C. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>-10</center></td><td rowspan="2"> , 0</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td></tr><tr><td style="text-align: center;">3</td></tr></table>
D. (2, 0)
Answer» C. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>-10</center></td><td rowspan="2"> , 0</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td></tr><tr><td style="text-align: center;">3</td></tr></table>
Discussion
137.

An open loop transfer function is given by, G(s) H(s) = K(s + 1)s(s + 2)(s2 + 25 + 2)

A. one zero at infinity
B. two zeros at infinity
C. three zeros at infinity
D. four zeros at infinity
Answer» D. four zeros at infinity
Discussion
138.

The root locus plot of the system having the loop transfer function,

A. no breakaway point
B. three real breakaway point
C. only one breakaway point
D. one real and two complex breakaway point
Answer» C. only one breakaway point
Discussion
139.

A phase-lag compensation will

A. improve relative stability
B. increase the speed of response
C. increase bandwidth
D. increase overshoot
Answer» E.
Discussion
140.

The root locus for K &lt; 0 for the transfer function expressed by G(s) H(s) = K s(s + 1)(s + 3)(s + 4)

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-916.jpg">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-917.jpg">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-918.jpg">
D. none of these
Answer» C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-918.jpg">
Discussion
141.

If open-loop transfer function of the system is

A. 4355
B. 5760
C. 9600
D. 9862
Answer» C. 9600
Discussion
142.

The transfer function of a compensating network is of the form

A. exactly equal to 0
B. between 0 and 1
C. exactly equal to 1
D. greater than 1
Answer» C. exactly equal to 1
Discussion
143.

The characteristic equation of a feedback control system is given by

A. ( 3, 0)
B. ( 2, 0)
C. ( 1, 0)
D. (2, 0)
Answer» C. ( 1, 0)
Discussion
144.

If characteristic equation of a closed-loop system is

A. zero
B. 2
C. 1
D. 2
Answer» D. 2
Discussion
145.

The open loop transfer function of a unity feedback control system is given by

A. zero and + 90 , 90
B. <table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and + 60 , -60 </td></tr><tr><td style="text-align: center;">3</td></tr></table>
C. zero and + 120 , 120
D. <table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and - 90 , + 90 </td></tr><tr><td style="text-align: center;">3</td></tr></table>
Answer» B. <table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and + 60 , -60 </td></tr><tr><td style="text-align: center;">3</td></tr></table>
Discussion
146.

Given a unity feedback system with open-loop transfer function

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-937.jpg">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-938.jpg">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-939.jpg">
D. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-940.jpg">
Answer» B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/11/as-938.jpg">
Discussion
147.

In the root-locus for open-loop transfer function

A. 2 and 1
B. 2.47 and 3.77
C. 4.27 and 7.23
D. 7.73 and 4.27
Answer» E.
Discussion
148.

The response c(t) of a system to an input r(t) is given by the following differential equation :

A. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 5</td></tr></table>
B. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + s</td></tr></table>
C. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3s</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 5</td></tr></table>
D. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s + 3</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + 5</td></tr></table>
Answer» B. <table><tr><td rowspan="2">G(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s<sup>2</sup> + 3s + s</td></tr></table>
Discussion
149.

The performance specifications for a unity feedback control system having an open-loop transfer function

A. K > 6
B. 6 < K < 10
C. K > 10
D. none of these
Answer» E.
Discussion
150.

A control system whose step response is

A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(s + 1)(s + 2)</td></tr></table>
B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">s(s + 2)</td></tr></table>
C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(s + 2)</td></tr></table>
D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>0.5</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(s + 1)(s + 2)</td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>0.5</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(s + 1)(s + 2)</td></tr></table>
Discussion