# Download VTU BE 2020 Jan ECE Question Paper 17 Scheme 3rd Sem 17EC35 Network Analysis

Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) ECE (Electronic engineering) 2017 Scheme 2020 January Previous Question Paper 3rd Sem 17EC35 Network Analysis

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. , 17EC35
Third Semester B.E. Degree Examination, Dec.219/Jan.2020
Network Analysis
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
Derive the expression for: (i) A to Y transformation (ii) Y to A transformation (10 Marks)
Calculate the voltage across the 6E2 resistor in the network of Fig.Q 1(b) using source
shifting technique.
Fig.Q1(b) (10 Marks)
OR
2 a. Determine the resistance between the terminals A and B of the network shown in Fig.Q2(a).
Fig.Q2(a) (10 Marks)
Find currents in all the branches of the network shown in Fig.Q2(b) using mesh analysis.
C-
/ 14
1
1
11
41 1161
-
ff
0
Fig.Q2(b) (05 Marks)
c.

Find voltages V
1
and V2 in the network shown in Fig.Q2(c) using node analysis method.
I LL
b.
6
2V
Fig.Q2(c) (05 Marks)
1 of 4
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USN
I)
0
z
4
E'
0
1:
1

. , 17EC35
Third Semester B.E. Degree Examination, Dec.219/Jan.2020
Network Analysis
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
Derive the expression for: (i) A to Y transformation (ii) Y to A transformation (10 Marks)
Calculate the voltage across the 6E2 resistor in the network of Fig.Q 1(b) using source
shifting technique.
Fig.Q1(b) (10 Marks)
OR
2 a. Determine the resistance between the terminals A and B of the network shown in Fig.Q2(a).
Fig.Q2(a) (10 Marks)
Find currents in all the branches of the network shown in Fig.Q2(b) using mesh analysis.
C-
/ 14
1
1
11
41 1161
-
ff
0
Fig.Q2(b) (05 Marks)
c.

Find voltages V
1
and V2 in the network shown in Fig.Q2(c) using node analysis method.
I LL
b.
6
2V
Fig.Q2(c) (05 Marks)
1 of 4
Module-2
3 a. Obtain Thevenin's equivalent network for Fig.Q3(a).
6o jn_
Fig.Q3(a) (08 Marks)
b. State and prove Miliman's theorem. (06 Marks)
c. For the circuit shown in Fig.Q3(c), find the voltage V
x
and verify reciprocity theorem.
2. 0
v
(10 Marks)
vV
Fig.Q5(c)
2 of 4
(06 Marks)
OR
4 a. ./State and prove maximum power transfer theorem for AC circuits (when R
L
and XL art.
-
7
varying) (10 Marks)
b. Find 'V' in the circuit shown in Fig.Q4(b) using super position theorem.
WA- 60V
il CIJ 104_ -
,,
3
Fig.Q4(b)
Module-3
5 a. What is the significance of initial conditions? Write a note on initial and final conditions for
basic circuit elements. (05 Marks)
b. In the network shown in Fig.Q5(b) switch `S' is changed from A to B at t = 0 having already
?V
established a steady state in position A shown that at t = 0', =i, = and
R
I
+R, +R,
i3 = 0
Fig.Q5(b) (10 Marks)
c. In the network of Fig.Q5(c) switch 'S' is closed at t = 0 with zero initial current in the
inductor. Find i, dt
d
and
dti
at t = 0
+
if R = 10 S2 L = 1 H and V = 10 Volts.
V
(05 Marks)
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USN
I)
0
z
4
E'
0
1:
1

. , 17EC35
Third Semester B.E. Degree Examination, Dec.219/Jan.2020
Network Analysis
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
Derive the expression for: (i) A to Y transformation (ii) Y to A transformation (10 Marks)
Calculate the voltage across the 6E2 resistor in the network of Fig.Q 1(b) using source
shifting technique.
Fig.Q1(b) (10 Marks)
OR
2 a. Determine the resistance between the terminals A and B of the network shown in Fig.Q2(a).
Fig.Q2(a) (10 Marks)
Find currents in all the branches of the network shown in Fig.Q2(b) using mesh analysis.
C-
/ 14
1
1
11
41 1161
-
ff
0
Fig.Q2(b) (05 Marks)
c.

Find voltages V
1
and V2 in the network shown in Fig.Q2(c) using node analysis method.
I LL
b.
6
2V
Fig.Q2(c) (05 Marks)
1 of 4
Module-2
3 a. Obtain Thevenin's equivalent network for Fig.Q3(a).
6o jn_
Fig.Q3(a) (08 Marks)
b. State and prove Miliman's theorem. (06 Marks)
c. For the circuit shown in Fig.Q3(c), find the voltage V
x
and verify reciprocity theorem.
2. 0
v
(10 Marks)
vV
Fig.Q5(c)
2 of 4
(06 Marks)
OR
4 a. ./State and prove maximum power transfer theorem for AC circuits (when R
L
and XL art.
-
7
varying) (10 Marks)
b. Find 'V' in the circuit shown in Fig.Q4(b) using super position theorem.
WA- 60V
il CIJ 104_ -
,,
3
Fig.Q4(b)
Module-3
5 a. What is the significance of initial conditions? Write a note on initial and final conditions for
basic circuit elements. (05 Marks)
b. In the network shown in Fig.Q5(b) switch `S' is changed from A to B at t = 0 having already
?V
established a steady state in position A shown that at t = 0', =i, = and
R
I
+R, +R,
i3 = 0
Fig.Q5(b) (10 Marks)
c. In the network of Fig.Q5(c) switch 'S' is closed at t = 0 with zero initial current in the
inductor. Find i, dt
d
and
dti
at t = 0
+
if R = 10 S2 L = 1 H and V = 10 Volts.
V
(05 Marks)
OR
(10 Marks)
17EC35
6 a. Obtain Laplace transform of:
(i) Step function
(ii) Ramp function
(iii) Impulse function
b
.
Find the Laplace transform of the waveform shown in Fig.Q6(b).
(10 Marks)
Module-4
7 a. Derive the relation between bandwidth and quality factor B.W = f
0
/Q. (10 Marks)
b. Show that the value of capacitance for max voltage across the capacitor in case of capacitor
tuning series resonance is given by C = R
2
+X' , ?

1
-

Fig.Q7(b) (10 Marks)
OR
8 a. Derive for f0 for parallel resonance circuit when the resistance of the capacitance is
considered.
Fig.Q8(a) (10 Marks)
b. Find the value of L for which the circuit in Fig.Q8(b) resonates at co = 5000 rad/sec.
/--
Fig.Q8(b) (10 Marks)
3 of 4
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USN
I)
0
z
4
E'
0
1:
1

. , 17EC35
Third Semester B.E. Degree Examination, Dec.219/Jan.2020
Network Analysis
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
Derive the expression for: (i) A to Y transformation (ii) Y to A transformation (10 Marks)
Calculate the voltage across the 6E2 resistor in the network of Fig.Q 1(b) using source
shifting technique.
Fig.Q1(b) (10 Marks)
OR
2 a. Determine the resistance between the terminals A and B of the network shown in Fig.Q2(a).
Fig.Q2(a) (10 Marks)
Find currents in all the branches of the network shown in Fig.Q2(b) using mesh analysis.
C-
/ 14
1
1
11
41 1161
-
ff
0
Fig.Q2(b) (05 Marks)
c.

Find voltages V
1
and V2 in the network shown in Fig.Q2(c) using node analysis method.
I LL
b.
6
2V
Fig.Q2(c) (05 Marks)
1 of 4
Module-2
3 a. Obtain Thevenin's equivalent network for Fig.Q3(a).
6o jn_
Fig.Q3(a) (08 Marks)
b. State and prove Miliman's theorem. (06 Marks)
c. For the circuit shown in Fig.Q3(c), find the voltage V
x
and verify reciprocity theorem.
2. 0
v
(10 Marks)
vV
Fig.Q5(c)
2 of 4
(06 Marks)
OR
4 a. ./State and prove maximum power transfer theorem for AC circuits (when R
L
and XL art.
-
7
varying) (10 Marks)
b. Find 'V' in the circuit shown in Fig.Q4(b) using super position theorem.
WA- 60V
il CIJ 104_ -
,,
3
Fig.Q4(b)
Module-3
5 a. What is the significance of initial conditions? Write a note on initial and final conditions for
basic circuit elements. (05 Marks)
b. In the network shown in Fig.Q5(b) switch `S' is changed from A to B at t = 0 having already
?V
established a steady state in position A shown that at t = 0', =i, = and
R
I
+R, +R,
i3 = 0
Fig.Q5(b) (10 Marks)
c. In the network of Fig.Q5(c) switch 'S' is closed at t = 0 with zero initial current in the
inductor. Find i, dt
d
and
dti
at t = 0
+
if R = 10 S2 L = 1 H and V = 10 Volts.
V
(05 Marks)
OR
(10 Marks)
17EC35
6 a. Obtain Laplace transform of:
(i) Step function
(ii) Ramp function
(iii) Impulse function
b
.
Find the Laplace transform of the waveform shown in Fig.Q6(b).
(10 Marks)
Module-4
7 a. Derive the relation between bandwidth and quality factor B.W = f
0
/Q. (10 Marks)
b. Show that the value of capacitance for max voltage across the capacitor in case of capacitor
tuning series resonance is given by C = R
2
+X' , ?

1
-

Fig.Q7(b) (10 Marks)
OR
8 a. Derive for f0 for parallel resonance circuit when the resistance of the capacitance is
considered.
Fig.Q8(a) (10 Marks)
b. Find the value of L for which the circuit in Fig.Q8(b) resonates at co = 5000 rad/sec.
/--
Fig.Q8(b) (10 Marks)
3 of 4
V
Fig.Q9(b)
171.
(10 Marks)
(10 Marks)
Module-5
9 a. Derive the expression of Z parameters in terms of Y parameters.
b. Determine Y and Z parameters for the network shown in Fig.Q9(b).
V 1 -0-1-
OR
10 a. Derive the expression of h parameters in terms of ABCD parameters. (10 Marks)
b. Find ABCD constants and show that AD ? BC = 1 for the network shown in Fig.Q10(b).
T
T2

air ,

v,t

U

Fig.Q 1 0(b) (10 Marks)
4 of 4
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