www.FirstRanker.com
www.FirstRanker.com
Roll No.
Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(EIE) (2011 & Onwards) (Sem.?4)
LINEAR CONTROL SYSTEMS
Subject Code : IC-204
M.Code : 57021
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.

SECTION-A
1.
Answer briefly :



a. What do you mean by servomechanism? Explain.

b. What do you mean by steady state error? Explain.

c. Define settling time and maximum overshoot.


d. Discuss the significance of time constant in first order system.


e. List the advantages and disadvantages of Routh-Hurwitz criterion.


f. Discuss the impowww.FirstRanker.com
rtance of Asymptotes in root locus.


g. Discuss the various test input signals used for time domain analysis.


h. Why compensation is required? Explain.

i. Discuss the importance of synchro in control system.


j. Discuss the importance of Laplace transform in control system.


1 | M-57021

(S2)-179
www.FirstRanker.com

---

www.FirstRanker.com
www.FirstRanker.com
SECTION-B
2. Differentiate :

a) Linear and non-linear systems

b) Open and closed loop systems

c) Time variant and time invariant systems
3.
Using Mathematical Modelling, find the x2(s)/f(t) of the system shown below :
f1
K1
M1
M
x1
f2
K2
M
M2 2
x2
f(t)

4.
What do you mean by order of a system? Determine the transient and steady state response
of first order system when unit step input is applied.
5.
Sketch the bode plot for the system when open loop transfer function is given by
50
G(s)
.
(s 2) (s 1)www.FirstRanker.com
6.
Explain in detail A.C. and D.C. tachometers used in control systems.

SECTION-C
50
7.
Design a phase lag compensating network for G(s)
.
s(1 0.1s) (1 0.2s)

to meet the following specifications : Kv = 30 sec?1, P.M. 40?

2 | M-57021

(S2)-179
www.FirstRanker.com

---

www.FirstRanker.com
www.FirstRanker.com

8.
a) Represent the following set of equations by a signal flow graph and determine the

overall gain relating x5 and x1.



x2 = a x1 + fx2



x3 = b x2 + ex4



x4 = c x3 + hx5



x5 = d x4 + gx2


b) Find whether the system shown below is stable or not?

4



2
s(s 1) (s 3) (s 4s 8)
9.
Discuss the following :

a) Root Locus

b) Servo motors






www.FirstRanker.com




NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.

3 | M-57021

(S2)-179
www.FirstRanker.com

---