Download VTU BE 2020 Jan ECE Question Paper 18 Scheme 3rd Sem 18EC32 Network Theory

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Fig.Q.1(b) TJ
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t, t Z
c.
Find the power delivered by lA current source using nodal analysis for the circuit shown in

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Fig.Q.1(c), (08 Marks)
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0
Third Semester 13. E. Degree Examination, Dec
-
.2
-

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0t9/San.2020
Network Theory
Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.

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Module-1
ti
1 a.
Using source transformation technique find the current through 50 resistor for the circuit
shown in Fie.Q.1(a) (06 Marks)

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wwv--
Fig.Q.1(a)
b. Use Mesh Analysis to determine the Mesh currents i
1
, i, and i3 for the network shown in

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o
ct
Fig.Q.1(b).
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(06 Marks)

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k

E -

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F. -I-
t t ;
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c
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0
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Fig.Q.1(c)
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(1)
0 2 a. Three Impedances are connected in delta, obtain the star equivalent of the network.
74 (06 Marks)
? -
b. Use Mesh Analysis to find the power delivered by the dependent voltage source in the

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.3;
Fig.Q.2(b)
-
Determine all the node voltages for the circuit shown in Fig.Q.2(c) using nodal analysis.
(08 Marks)

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Fig.Q.2(
?I
12-
0-V
OR

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circuit shown in Fig.Q.2(b). (06 Marks)
)

1 of 4
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18EC32


USN

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Fig.Q.1(b) TJ
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D

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.

t, t Z
c.
Find the power delivered by lA current source using nodal analysis for the circuit shown in

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Fig.Q.1(c), (08 Marks)
1_ A
,07-1
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3 (-)

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C. '
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ti)
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CV

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c.

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0
Third Semester 13. E. Degree Examination, Dec
-
.2
-

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0t9/San.2020
Network Theory
Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.

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Module-1
ti
1 a.
Using source transformation technique find the current through 50 resistor for the circuit
shown in Fie.Q.1(a) (06 Marks)

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wwv--
Fig.Q.1(a)
b. Use Mesh Analysis to determine the Mesh currents i
1
, i, and i3 for the network shown in

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o
ct
Fig.Q.1(b).
^
(06 Marks)

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(
oc
k

E -

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F. -I-
t t ;
?
c
'

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0
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0
?

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O
?
c

8

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C
.
Fig.Q.1(c)
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- ;7..:

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(1)
0 2 a. Three Impedances are connected in delta, obtain the star equivalent of the network.
74 (06 Marks)
? -
b. Use Mesh Analysis to find the power delivered by the dependent voltage source in the

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.3;
Fig.Q.2(b)
-
Determine all the node voltages for the circuit shown in Fig.Q.2(c) using nodal analysis.
(08 Marks)

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Fig.Q.2(
?I
12-
0-V
OR

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circuit shown in Fig.Q.2(b). (06 Marks)
)

1 of 4
g.Q.3(b)

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181
Module-2
3 a. State and explain superposition theorem (06 Mark:
b.
Use Millman's Theorem to find the current flowing through (2 + PO impedance for the

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circuit shown in Fig.Q.3(b). (08 Marks)
c. State and prove Norton's theorem. (06 Marks)
OR
4 a. Find the Thevenin's equivalent for the circuit shown inFig.Q.4(a) with respect to
terminals X-Y. (08 Marks)

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Fig.Q.4(a)
b. Find the condition for maximum power transfer in the AC circuit, where both RL and X
L
are
varying. (06 Marks)

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c. Determine the current through the load resistance using Norton's Theorem for the circuit
shown .in Fig.Q.4(c). (06 Marks)
TV"
94-
Fig.Q.4(c)

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5 a.
Module-3
Explain the behavior of R, L, C elements at the time of switching at t = 0, at t = 0
+
and t = 00.

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(07 Marks)
? di
b. In the network shown in Fig.Q.5(b). Find i, ? and at t = O. Assume that the capacitor
dt dt
is initially uncharged. (07 Marks

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151
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4
F
Fig.Q.5(b)
c. In the network shown in Fig.Q.5(0 find, i, ?
di

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and at t 0. The swich k is closed at
dt
t = 0 with zero current in the inductor. (06 Marks)
-<
(-

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R
0,
Fig.Q.5(c)
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18EC32


USN

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Fig.Q.1(b) TJ
5
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D

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.

t, t Z
c.
Find the power delivered by lA current source using nodal analysis for the circuit shown in

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Fig.Q.1(c), (08 Marks)
1_ A
,07-1
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3 (-)

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C. '
O
?
'Gy

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ti)
?^
t
?

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-
E. 8
>-%
CV

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O
O
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Pu
c.

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0
Third Semester 13. E. Degree Examination, Dec
-
.2
-

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0t9/San.2020
Network Theory
Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.

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Module-1
ti
1 a.
Using source transformation technique find the current through 50 resistor for the circuit
shown in Fie.Q.1(a) (06 Marks)

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wwv--
Fig.Q.1(a)
b. Use Mesh Analysis to determine the Mesh currents i
1
, i, and i3 for the network shown in

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o
ct
Fig.Q.1(b).
^
(06 Marks)

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(
oc
k

E -

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F. -I-
t t ;
?
c
'

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0
? 7 -
0
?

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?
c

8

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C
.
Fig.Q.1(c)
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- ;7..:

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(1)
0 2 a. Three Impedances are connected in delta, obtain the star equivalent of the network.
74 (06 Marks)
? -
b. Use Mesh Analysis to find the power delivered by the dependent voltage source in the

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.3;
Fig.Q.2(b)
-
Determine all the node voltages for the circuit shown in Fig.Q.2(c) using nodal analysis.
(08 Marks)

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Fig.Q.2(
?I
12-
0-V
OR

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circuit shown in Fig.Q.2(b). (06 Marks)
)

1 of 4
g.Q.3(b)

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181
Module-2
3 a. State and explain superposition theorem (06 Mark:
b.
Use Millman's Theorem to find the current flowing through (2 + PO impedance for the

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circuit shown in Fig.Q.3(b). (08 Marks)
c. State and prove Norton's theorem. (06 Marks)
OR
4 a. Find the Thevenin's equivalent for the circuit shown inFig.Q.4(a) with respect to
terminals X-Y. (08 Marks)

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Fig.Q.4(a)
b. Find the condition for maximum power transfer in the AC circuit, where both RL and X
L
are
varying. (06 Marks)

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c. Determine the current through the load resistance using Norton's Theorem for the circuit
shown .in Fig.Q.4(c). (06 Marks)
TV"
94-
Fig.Q.4(c)

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5 a.
Module-3
Explain the behavior of R, L, C elements at the time of switching at t = 0, at t = 0
+
and t = 00.

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(07 Marks)
? di
b. In the network shown in Fig.Q.5(b). Find i, ? and at t = O. Assume that the capacitor
dt dt
is initially uncharged. (07 Marks

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151
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jZt r67d1"
lov
- k uil

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4
F
Fig.Q.5(b)
c. In the network shown in Fig.Q.5(0 find, i, ?
di

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and at t 0. The swich k is closed at
dt
t = 0 with zero current in the inductor. (06 Marks)
-<
(-

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R
0,
Fig.Q.5(c)
2 of 4
.+

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Lic:
,
(3v
dl
1,000J1.-

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18EC32
OR
6 a. In the network shown in Fig.Q.6(a). The switch k is changed from position a to b at t = 0,
di d
2

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i
the steady state is reached at position a. Find i, ? and at t = 0
1
. Assume that the
dt dt

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2

capacitor is initially uncharged. (10 Marks)
b.
Fig.Q.6(a)

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For the network shown in Fig.Q.6(b). The network is in steady state with switch k is closed.
At t = 0, the switch is opened. Determine the voltage across the switch Vk and ?
d
V
k

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at
dt
t = (10 Marks)
F
Fig.Q.6(b)

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Module-4
7 a. Obtain Laplace transform of
i) Step function
ii) Ramp function
iii) Impulse function.

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b. Find the Laplace transform of the periodic signal x(t) as shown in Fig.Q.7(b).
.T.Eu
Fig.Q.7(b)
(09 Marks)
(11 Marks)

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OR
8 a. In the series RL circuit shown in Fig.Q.8(a)? the source voltage is v(t) = 50 sin 2501V. Using
Laplace transform determine, the current when switch K is closed at t = 0. (10 Marks)
9.. 5.5
1

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?
a.aog
Fig.Q.8(a)
b.
Find the Laplace transform of the non-sinusoidal periodic waveform shown in Fig.Q.8(b)

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4.a.)
Fig.Q.S(b) (10 Marks)
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18EC32

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USN


Fig.Q.1(b) TJ

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5
(
D
.

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t, t Z
c.
Find the power delivered by lA current source using nodal analysis for the circuit shown in
Fig.Q.1(c), (08 Marks)
1_ A

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,07-1
? ,z '
3 (-)
C. '
O

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?
'Gy

? tZ
ti)

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t
?
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-

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E. 8
>-%
CV
O
O

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z
Pu
c.
0
Third Semester 13. E. Degree Examination, Dec

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-
.2
-
0t9/San.2020
Network Theory

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Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
ti

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1 a.
Using source transformation technique find the current through 50 resistor for the circuit
shown in Fie.Q.1(a) (06 Marks)
wwv--
Fig.Q.1(a)

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b. Use Mesh Analysis to determine the Mesh currents i
1
, i, and i3 for the network shown in
o
ct

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Fig.Q.1(b).
^
(06 Marks)
(
oc

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k

E -
F. -I-
t t ;

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?
c
'
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0

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? 7 -
0
?
O
?

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c

8
C
.

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Fig.Q.1(c)
?
- ;7..:
(1)
0 2 a. Three Impedances are connected in delta, obtain the star equivalent of the network.

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74 (06 Marks)
? -
b. Use Mesh Analysis to find the power delivered by the dependent voltage source in the
.3;
Fig.Q.2(b)

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-
Determine all the node voltages for the circuit shown in Fig.Q.2(c) using nodal analysis.
(08 Marks)
Fig.Q.2(
?I

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12-
0-V
OR
circuit shown in Fig.Q.2(b). (06 Marks)
)

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1 of 4
g.Q.3(b)
181
Module-2

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3 a. State and explain superposition theorem (06 Mark:
b.
Use Millman's Theorem to find the current flowing through (2 + PO impedance for the
circuit shown in Fig.Q.3(b). (08 Marks)
c. State and prove Norton's theorem. (06 Marks)

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OR
4 a. Find the Thevenin's equivalent for the circuit shown inFig.Q.4(a) with respect to
terminals X-Y. (08 Marks)
Fig.Q.4(a)
b. Find the condition for maximum power transfer in the AC circuit, where both RL and X

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L
are
varying. (06 Marks)
c. Determine the current through the load resistance using Norton's Theorem for the circuit
shown .in Fig.Q.4(c). (06 Marks)

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TV"
94-
Fig.Q.4(c)
5 a.
Module-3

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Explain the behavior of R, L, C elements at the time of switching at t = 0, at t = 0
+
and t = 00.
(07 Marks)
? di

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b. In the network shown in Fig.Q.5(b). Find i, ? and at t = O. Assume that the capacitor
dt dt
is initially uncharged. (07 Marks
151
.'

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jZt r67d1"
lov
- k uil
4
F

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Fig.Q.5(b)
c. In the network shown in Fig.Q.5(0 find, i, ?
di
and at t 0. The swich k is closed at
dt

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t = 0 with zero current in the inductor. (06 Marks)
-<
(-
R
0,

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Fig.Q.5(c)
2 of 4
.+
Lic:
,

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(3v
dl
1,000J1.-
18EC32
OR

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6 a. In the network shown in Fig.Q.6(a). The switch k is changed from position a to b at t = 0,
di d
2
i
the steady state is reached at position a. Find i, ? and at t = 0

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1
. Assume that the
dt dt
2

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capacitor is initially uncharged. (10 Marks)
b.
Fig.Q.6(a)
For the network shown in Fig.Q.6(b). The network is in steady state with switch k is closed.
At t = 0, the switch is opened. Determine the voltage across the switch Vk and ?

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d
V
k
at
dt

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t = (10 Marks)
F
Fig.Q.6(b)
Module-4
7 a. Obtain Laplace transform of

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i) Step function
ii) Ramp function
iii) Impulse function.
b. Find the Laplace transform of the periodic signal x(t) as shown in Fig.Q.7(b).
.T.Eu

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Fig.Q.7(b)
(09 Marks)
(11 Marks)
OR
8 a. In the series RL circuit shown in Fig.Q.8(a)? the source voltage is v(t) = 50 sin 2501V. Using

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Laplace transform determine, the current when switch K is closed at t = 0. (10 Marks)
9.. 5.5
1
?
a.aog

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Fig.Q.8(a)
b.
Find the Laplace transform of the non-sinusoidal periodic waveform shown in Fig.Q.8(b)
4.a.)
Fig.Q.S(b) (10 Marks)

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Module-5
9 a. Define Z parameters. Determine Z parameters interrns of Y parameters.
b. Determine h parameters of the circuit shown in Fig.Q.9(b)
4_51.
uz

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181
(06 Mark.
(07 Marks)

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Fig.Q.9(b)

c. For the network shown in Fig.Q.9(c). Find the transmission parameters.

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31.2_,_
i

\./
(07 Marks)

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Fig.Q.9(c)
OR
10 a. Define Q-factor, selectivity and Band width. (03 Marks)
b.
A series RLC circuit has a resistance of 100, an inductance of 0.3H and a capacitance of

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1001AF. The applied voltage is 230V. Find: i) The resonant frequency ii) lower and upper
cut off frequencies iii) current at resonance iv) currents at f
i
and f2 v) Voltage across.
the inductance at resonance. (07 Marks)

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c. Derive the expression for the resonant frequency of the circuit shown in Fig.Q.10(c). Also
show that the circuit will resonate at all frequency if R = R
c
. =
L

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C
.

(10 Marks)
Fig.Q.10(c)

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