PTU Punjab Technical University B-Tech May 2019 Question Papers 4th Semester Robotics ECE Engineering
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2011 & Onward) (Sem.?4)
LINEAR CONTROL SYSTEMS
Subject Code : BTEE-402
M.Code : 57108
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
Q1. Write briefly :
a. What do you mean by plant and system? Explain.
b. List the mechanical and electrical analogies.
c. Explain how the pole zero locations effect the stability of the system.
d. Explain the step and impulse test input signals.
e. List the advantages and disadvantages of root locus technique.
f. What do you mean by relative stability? Explain.
g. Discuss the need of compensation.
h. List the main characteristics of servomotors.
i. Define state and state vector.
j. What is Controllability and Observability of a system?
SECTION-B
Q2. Explain the following in detail with suitable examples
a. Open and closed loop systems
b. Continuous and sampled data control systems
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Q3. What is the need of signal flow graphs? List the different rules to draw the signal flow
graphs. Determine the overall transmittance relating x2 and xi for the signal flow graph
shown below
b
c
d
a
e
f
h
x1
x2
g
Fig.1
Q4. Using the Routh-Hurwitz criterion determine the relation between K and T so that unity
K
feedback control system having open loop transfer function G(s)H(s)
is
s s (s 10) T
stable.
K
Q5. The open loop transfer function of a system is given by G(s)H(s)
of the system
s(sT 1)
using Nyquist Criterion.
Q6. Explain the different steps required to draw a root locus.
SECTION-C
Q7.
Discuss the following :
a. Tachogenerators
b. Series and parallel compensators
Q8. Sketch the Bode plot for the transfer function given below :
48(s 10)
G(s)H (s)
2
s(s 20) (s 2.4s 16)
Apply correction to magnitude plot for the quadratic term and comment on the stability.
Q9. Find controllability and observability of given system :
1
1
x
0
1
0 x
1
2
2
x
0
0
1 . x
0 .u(t)
3
3
x 6
11
6
x
0
1
x
y 10 5
2
1
x
3
x
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.
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This post was last modified on 04 November 2019