PTU B.Tech EEE 3rd Semester May 2019 57092 CIRCUIT THEORY Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Electrical Engineering & Industrial Control) (2012 Onwards)
B.Tech.(EE/Electrical & Electronics/E lectronics & E lectrical) (2011 Onwards)
(Sem.?3)
CIRCUIT THEORY
Subject Code : BTEE-301
M.Code : 57092
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. Differentiate between independent and dependent sources.


b. What do you mean by transient response? Explain.


c. State reciprocity theorem.

d. Find the Laplace transform of a unit ramp function.


e. What is the significance of transfer function? Explain.

f. Discuss the significance of circuit theory in engineering.


g. Discuss the need of frequency domain analysis.

h. What do you mean by network functions? Explain.


i. Why network synthesis is required? Explain.


j. List the advantages of m-derived filters.
SECTION-B
2.
Determine the characteristic impedance and propagation constant of the symmetrical T-
network.
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3
Find the voltage across X and Y using Thevenin's theorem.
R1
R3
(3 )

(2 )

2A
I I1
I2
x
y
R2
R4
(2 )

(3 )


FIG.1
4.
Discuss the importance of Laplace transform. Find the Laplace transform of cos t
u(t-t0).
5.
Discuss the significance of pole and zeros in a network. Also list the various restrictions
on the pole and zero location in transfer functions.
6.
What is the need of a filter? Discuss in detail high pass, low pass, band pass and band
reject filters.

SECTION-C
7.
Find the current in 10ohm resistor using superposition theorem.
5
2A
1
1
1A
+
10V
10

FIG.2
8.
Find V2/V1 and V2/I1 of the figure shown below :
I1
I2
+
1
1
1
+
v1
1
1
1
v2
1

FIG.3
9.
Explain the following :

a. Design of constant K filter

b. Convolution theorem


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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