Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ECE (Electronics And Communications Engineering) 2020 March 4th Sem M 57105 Control Systems Previous Question Paper
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(ECE/Electronics & Electrical Engg.)
(2012 to 2017)
B.Tech.(EE/Electrical & Electronics Engg.) (2012 Onwards)
(Sem.?4)
LINEAR CONTROL SYSTEMS
Subject Code : BTEE-402
M.Code : 57105
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION?A
1. Answer briefly :
a. What is control system? Why is it required?
b. List the mechanical and electrical analogies.
c. What do you mean by steady state error? Discuss.
d. Explain the ramp and impulse test input signals.
e. Differentiate between open-loop and closed- loop systems with examples.
f. What is the significance of mathematical modeling?
g. Why compensation is required? Explain.
h. List the main characteristics of synchros.
i. What do you mean by relative stability? Explain.
j. What is rise time? Discuss its significance.
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1 | M-57105 (S2)-2018
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(ECE/Electronics & Electrical Engg.)
(2012 to 2017)
B.Tech.(EE/Electrical & Electronics Engg.) (2012 Onwards)
(Sem.?4)
LINEAR CONTROL SYSTEMS
Subject Code : BTEE-402
M.Code : 57105
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION?A
1. Answer briefly :
a. What is control system? Why is it required?
b. List the mechanical and electrical analogies.
c. What do you mean by steady state error? Discuss.
d. Explain the ramp and impulse test input signals.
e. Differentiate between open-loop and closed- loop systems with examples.
f. What is the significance of mathematical modeling?
g. Why compensation is required? Explain.
h. List the main characteristics of synchros.
i. What do you mean by relative stability? Explain.
j. What is rise time? Discuss its significance.
2 | M-57105 (S2)-2018
SECTION-B
2. Explain the following :
a. Linear and non-linear systems
b. Time- variant and time-invariant systems
3. Find the transfer function of the block diagram having two inputs (Xl(s) and X2(s)) and
one output Y(s).
Fig.1
4. The characteristic equation of a feedback control system is given by
s
4
+ 20s
3
+ 15s
2
+ 2s + K = 0
Determine the range of values of K for the system to be stable. Can the system be
marginally stable? If so, find the values of K and frequency of sustained oscillation.
5. The open loop transfer function of a system is given by ( ) ( ) .
(2 1)
K
G s H s
s s
?
?
Determine
the stability of the system using Nyquist Criterion.
6. Find the open loop transfer function with proper explanation from the Bode Plot shown
below :
Fig.2
H (s)
3
G (s)
2
G (s)
1
X (s)
1
X (s)
2
+
?
+
+
Y(s)
dB
6 dB/octave
12 dB/octave
32
?6 dB/octave
0.5 5
log ( c) ?
1
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1 | M-57105 (S2)-2018
Roll No. Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(ECE/Electronics & Electrical Engg.)
(2012 to 2017)
B.Tech.(EE/Electrical & Electronics Engg.) (2012 Onwards)
(Sem.?4)
LINEAR CONTROL SYSTEMS
Subject Code : BTEE-402
M.Code : 57105
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION?A
1. Answer briefly :
a. What is control system? Why is it required?
b. List the mechanical and electrical analogies.
c. What do you mean by steady state error? Discuss.
d. Explain the ramp and impulse test input signals.
e. Differentiate between open-loop and closed- loop systems with examples.
f. What is the significance of mathematical modeling?
g. Why compensation is required? Explain.
h. List the main characteristics of synchros.
i. What do you mean by relative stability? Explain.
j. What is rise time? Discuss its significance.
2 | M-57105 (S2)-2018
SECTION-B
2. Explain the following :
a. Linear and non-linear systems
b. Time- variant and time-invariant systems
3. Find the transfer function of the block diagram having two inputs (Xl(s) and X2(s)) and
one output Y(s).
Fig.1
4. The characteristic equation of a feedback control system is given by
s
4
+ 20s
3
+ 15s
2
+ 2s + K = 0
Determine the range of values of K for the system to be stable. Can the system be
marginally stable? If so, find the values of K and frequency of sustained oscillation.
5. The open loop transfer function of a system is given by ( ) ( ) .
(2 1)
K
G s H s
s s
?
?
Determine
the stability of the system using Nyquist Criterion.
6. Find the open loop transfer function with proper explanation from the Bode Plot shown
below :
Fig.2
H (s)
3
G (s)
2
G (s)
1
X (s)
1
X (s)
2
+
?
+
+
Y(s)
dB
6 dB/octave
12 dB/octave
32
?6 dB/octave
0.5 5
log ( c) ?
1
3 | M-57105 (S2)-2018
SECTION-C
7. A unity feedback system has an open loop transfer function
2
( ) ( ) .
( 2)
K
G s H s
s s
?
?
By
sketching the root locus plot, show that the system is unstable for all values of K.
8. Discuss the dynamic response of the first order system when :
a. Step input is applied
b. Sinusoidal input is applied
9. Discuss the following :
a. Lag compensation
b. Magnetic Amplifier
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 21 March 2020