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Previous year question hub

Stability Analysis and Root Locus - Control Systems - Electronics & Communication Engineering Previous Year Questions

Practice Stability Analysis and Root Locus - Control Systems - Electronics & Communication Engineering previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

23Papers
17Years
44Questions
1Topics

Stability Analysis and Root Locus question pattern

Every graph below is calculated only from this selection.

Questions by year

Compare question counts across years.

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 35 79.5%
Easy 5 11.4%
Hard 4 9.1%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 31 70.5%
Numerical Answer Type (NAT) 11 25%
MSQ 1 2.3%
Fill in the blanks 1 2.3%

Subject weightage

Top subjects by unique question coverage.

Electronics & Communication Engineering
44 Qs

Most asked topics

Top topics across the included previous year papers.

Control Systems
44 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Stability Analysis and Root Locus
44 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Electronics and Communication Engineering (EC) 2026
1 Qs
Electronics & Communication Engineering (EC) 2025
4 Qs
Electronics & Communication Engineering (EC) 2024
1 Qs
Electronics & Communication Engineering (EC) 2023
1 Qs
Electronics & Communication Engineering (EC) 2022
2 Qs
Electronics & Communication Engineering (EC) 2021
2 Qs
Electronics & Communication Engineering (EC) 2020
3 Qs
Electronics & Communication Engineering (EC) 2019
1 Qs
Electronics & Communication Engineering (EC) 2018
2 Qs
Electronics & Communication Engineering (EC) 2017 [Session 1]
3 Qs
Electronics & Communication Engineering (EC) 2017
2 Qs
Electronics & Communication Engineering (EC) 2017 [Session 2]
2 Qs
Electronics & Communication Engineering (EC) 2016 [Session 1]
2 Qs
Electronics & Communication Engineering (EC) 2016 [Session 2]
2 Qs
Electronics & Communication Engineering (EC) 2016 [Session 3]
2 Qs
Electronics & Communication Engineering (EC) 2014 [Session 1]
2 Qs
Electronics & Communication Engineering (EC) 2014 [Session 4]
2 Qs
Electronics & Communication Engineering (EC) 2014 [Session 3]
1 Qs
Electronics & Communication Engineering (EC) 2012
1 Qs
Electronics & Communication Engineering (EC) 2011
2 Qs
Electronics & Communication Engineering (EC) 2009
2 Qs
Electronics & Communication Engineering (EC) 2008
2 Qs
Electronics & Communication Engineering (EC) 2007
2 Qs

Included previous year papers

Newest papers appear first. Search these papers or sort by year and name.

Paper nameYearPDFAttempt
Electronics and Communication Engineering (EC) 20262026
1 questions in this view		2026
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Electronics & Communication Engineering (EC) 20252025
4 questions in this view		2025
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20242024
1 questions in this view		2024
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20232023
1 questions in this view		2023
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Electronics & Communication Engineering (EC) 20222022
2 questions in this view		2022
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Electronics & Communication Engineering (EC) 20212021
2 questions in this view		2021
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Electronics & Communication Engineering (EC) 20202020
3 questions in this view		2020
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20192019
1 questions in this view		2019
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20182018
2 questions in this view		2018
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20172017
2 questions in this view		2017
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Electronics & Communication Engineering (EC) 2017 [Session 1]2017
3 questions in this view		2017
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2017 [Session 2]2017
2 questions in this view		2017
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Electronics & Communication Engineering (EC) 2016 [Session 1]2016
2 questions in this view		2016
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2016 [Session 2]2016
2 questions in this view		2016
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2016 [Session 3]2016
2 questions in this view		2016
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2014 [Session 1]2014
2 questions in this view		2014
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2014 [Session 3]2014
1 questions in this view		2014
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 2014 [Session 4]2014
2 questions in this view		2014
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20122012
1 questions in this view		2012
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20112011
2 questions in this view		2011
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20092009
2 questions in this view		2009
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20082008
2 questions in this view		2008
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Official question paperOriginal authority-issued PDF Official Download
Electronics & Communication Engineering (EC) 20072007
2 questions in this view		2007
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All Stability Analysis and Root Locus previous year questions

Practice every matching question in batches of 20, with every available option.

1
2007 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2007
If the closed-loop transfer function of a control system is \(T(s) = \frac{s-5}{(s+2)(s+3)}\), then it is
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2
2007 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2007
A unity feedback control system has an open-loop transfer function \(G(s) = \frac{K}{s(s^2+7s+12)}\). The gain \(K\) for which \(s = -1 + j1\) will lie on the root locus of this system is
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3
2008 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2008
A certain system has transfer function \[G(s)=\frac{s+8}{s^2+\alpha s-4}\] where \(\alpha\) is a parameter. Consider the standard negative unity feedback configuration as shown below.\n\nWhich of the following statements is true?

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4
2008 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2008
The number of open right half plane poles of \[G(s)=\frac{10}{s^5+2s^4+3s^3+6s^2+5s+3}\] is

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5
2009 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2009
The feedback configuration and the pole-zero locations of \(G(s) = \frac{s^2 - 2s + 2}{s^2 + 2s + 2}\) are shown below. The root locus for negative values of \(k\), i.e., for \(-\infty < k < 0\), has breakaway/ break-in points and angle of departure at pole P (with respect to the positive real axis) equal to

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6
2009 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2009

The gain and phase margins of G(s) for closed loop stability are

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7
2011 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2011

The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by

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8
2011 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2011
The gain margin of the system under closed loop unity negative feedback is
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9
2012 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2012

The feedback system shown below oscillates at 2 rad/s when

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10
2014 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2014 [Session 1]
Consider the feedback system shown in the figure. The Nyquist plot of \(G(s)\) is also shown. Which one of the following conclusions is correct?
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11
2014 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2014 [Session 1]
The phase margin in degrees of \(G(s) = \frac{10}{(s+0.1)(s+1)(s+10)}\) calculated using the asymptotic Bode plot is ______.
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12
2014 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2014 [Session 3]
In the root locus plot shown in the figure, the pole/zero marks and the arrows have been removed. Which one of the following transfer functions has this root locus?

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13
2014 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2014 [Session 4]
Consider a transfer function \(G_p(s) = \frac{ps^2+3ps-2}{s^2+(3+p)s+(2-p)}\) with \(p\) a positive real parameter. The maximum value of \(p\) until which \(G_p\) remains stable is ________.
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14
2014 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2014 [Session 4]
The characteristic equation of a unity negative feedback system is \(1 + KG(s) = 0\). The open loop transfer function \(G(s)\) has one pole at 0 and two poles at -1. The root locus of the system for varying \(K\) is shown in the figure. The constant damping ratio line, for \(\xi=0.5\), intersects the root locus at point A. The distance from the origin to point A is given as 0.5. The value of \(K\) at point A is ________.
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15
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 1]
A closed-loop control system is stable if the Nyquist plot of the corresponding open-loop transfer function
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16
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 1]
The open-loop transfer function of a unity-feedback control system is \( G(s) = \frac{K}{s^2+5s+5} \) The value of K at the breakaway point of the feedback control system's root-locus plot is __________
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17
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 2]
The number and direction of encirclements around the point \( -1 + j0 \) in the complex plane by the Nyquist plot of \( G(s) = \frac{1-s}{4+2s} \) is
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18
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 2]
In the feedback system shown below \(G(s) = \frac{1}{(s+1)(s+2)(s+3)}\) . The positive value of \(k\) for which the gain margin of the loop is exactly 0 dB and the phase margin of the loop is exactly zero degree is ______
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19
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 3]
The first two rows in the Routh table for the characteristic equation of a certain closed-loop control system are given as
\(s^3\)1\((2K + 3)\)
\(s^2\)\(2K\)4

The range of \(K\) for which the system is stable is
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20
2016 · Electronics & Communication Engineering · Control Systems · Stability Analysis and Root Locus
Electronics & Communication Engineering (EC) 2016 [Session 3]
The forward-path transfer function and the feedback-path transfer function of a single loop negative feedback control system are given as
\[G(s) = \frac{K(s+2)}{s^2 + 2s + 2} \quad \text{and} \quad H(s) = 1,\]
respectively. If the variable parameter \(K\) is real positive, then the location of the breakaway point on the root locus diagram of the system is __________
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Showing 20 of 44 questions