Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EEE 3rd Sem 76463 Electrical Circuit Analysis Previous Question Paper
Total No. of Pages : 03
Total No. of Questions : 18
B.Tech. (Electrical & Electronics/Electronics & Electrical)
(2018 Batch) (Sem.?3)
ELECTRICAL CIRCUIT ANALYSIS
Subject Code : BTEEE-301-18
M.Code : 76463
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
State reciprocity theorem.
2.
What do you mean by steady state response? Explain.
3.
Explain the importance of phasor diagrams.
4.
List the advantages of Laplace transform.
5.
Differentiate between passband and band reject filters.
6.
What do you mean by an ideal transformer? What is the need of a transformer? Discuss.
7.
What do you mean by natural response of the network? Explain.
8.
Compare constant k and m-derived filters.
9.
What is the effect of poles and zeros in a system? Explain.
10. Why two port networks are required? Explain.
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SECTION-B
11. Obtain the Thevenin equivalent for the bridge circuit of the figure shown below at terminal
xy.
21
50
x
y
+
20V
12
30
?
j24
60
FIG.1
12. Design a constant-K low pass filter to be terminated in 600 ohm, having a cut-off
frequency of 3kHz. Determine :
i) The frequency at which the filter offers attenuation of 17.372 dB
ii) Attenuation at 6kHz
iii) The characteristic impedance and phase constant at 2 kHZ.
13. Two identical sections of the network shown in figure are connected in series. Obtain the Z
parameters of the combination and verify the result by direct calculation.
2
2
1
FIG.2
14. For the given polynomial F(s) = s4 + 3s3 + 3s2 + 2s + K, Determine the range of parameter
K for the system to be stable using Routh-Hurwitz stability criterion.
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15. For the circuit shown in figure, determine the voltage and the current in the circuit and
obtain an expression for the power delivered by the source.
Assume the switch is closed at time t=0 and the circuit is under steady state.
25
5h
50v
i (t)
For t < 0
FIG.3
SECTION-C
16. Determine the Foster and Cauer form of realization of the given driving- point impedance
4 2
s
1 2
s 9
function Z s
.
s 2
s 4
17. For the circuit given in figure, calculate the current following through the load connected
across AB using Nodal analysis. Verify your result using mesh analysis.
2
200F
3mH
3
P
Q
R
A
5
+
4i
~
1
100?V
?
2mH
U
T
S
B
FIG.4
18. Discuss the following :
i) Parallel Resonance
ii) Filters and their classification
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 26 June 2021