Download JNTUA B.Tech 1-2 R15 2019 June 15A04201 Network Analysis Question Paper

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NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

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PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)

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(a) Determine the voltage drop across the 10 ? resistance in the circuit shown in figure.

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(b) State maximum power transfer theorem.

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(c) Distinguish between natural and forced response.
(d) Write the differences between RL and RC transient circuits.
(e) If the phase angle ? is 45
o
, what is the power factor?

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(f) Define instantaneous power and average power.
(g) Determine the resonant frequency for the circuit shown in figure below.

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(h) Illustrate the concept of mutual inductance.

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(i) For a given Z
11
=3 ?, Z
12
=1 ?, Z

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21
=2 ? and Z
22
=1 ?, find the admittance matrix and the product of ?
?

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and ?
? .
(j) For a two port network, define and relate Decibel and Neper.

PART ? B

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(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 By applying the superposition theorem determine the node voltage V

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1
and V
2
for the network shown
in figure.

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OR
Contd. in page 2

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Page 1 of 3
R15
20 ?
10 ?
5 ?

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15 A
10 A
A
B
~

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10 ?
0.5 mH
10 ?F
Vs
+ +

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- -
1 ? 2 ? 2 ?
2 V
1 A
2 ?

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V 1 V 2
? ?
4 V
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Code: 15A04201


B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
NETWORK ANALYSIS

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(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

PART ? A

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(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Determine the voltage drop across the 10 ? resistance in the circuit shown in figure.

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(b) State maximum power transfer theorem.
(c) Distinguish between natural and forced response.

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(d) Write the differences between RL and RC transient circuits.
(e) If the phase angle ? is 45
o
, what is the power factor?
(f) Define instantaneous power and average power.

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(g) Determine the resonant frequency for the circuit shown in figure below.

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(h) Illustrate the concept of mutual inductance.
(i) For a given Z

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11
=3 ?, Z
12
=1 ?, Z
21

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=2 ? and Z
22
=1 ?, find the admittance matrix and the product of ?
?
and ?

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? .
(j) For a two port network, define and relate Decibel and Neper.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

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UNIT ? I

2 By applying the superposition theorem determine the node voltage V
1

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and V
2
for the network shown
in figure.

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OR
Contd. in page 2

Page 1 of 3

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R15
20 ?
10 ?
5 ?
15 A

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10 A
A
B
~
10 ?

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0.5 mH
10 ?F
Vs
+ +
- -

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1 ? 2 ? 2 ?
2 V
1 A
2 ?
V 1 V 2

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? ?
4 V

Code: 15A04201

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3 Determine the current flowing through 1.5 ? resistor in the circuit shown in figure by loop analysis.

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UNIT ? II

4 (a) A series RL circuit with R = 30 ? and L = 15H has a constant voltage V = 60V applied at t = 0 as
shown in figure below.

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Determine the current I, voltage across the resistor and inductor.
(b) In the given circuit shown in figure below, the switch k is closed at time t = 0, the steady state
condition having reached preciously. Obtain the expression for the current in the circuit at any time t.
If R

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1
= R
2
= 100 ?, ? = 10v and L = 1H, calculate at time t = 5 ms (i) Current I. (ii) Voltage drop
across R

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2
. (iii) Voltage across L.

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OR
5 (a) An RL series circuit is excited by a sinusoidal source e(t) = 10sin100t volts, by closing the switch at

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t = 0. Take R = 10 ? and L = 0.1H. Determine the current i(t) flowing through the RL circuit.
(b) For the circuit shown in figure below, find the current equation when the switch is opened at t = 0.

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Contd. in page 3

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Page 2 of 3

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2 ? 2 ? 6 ?
1 ?
8 ?
1.5 ?
10 ?

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I
20 A
30 A
60 v
15 H

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30 ?
s
i
R 1
R 2

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L
K
+
-
10 ?

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2 ?F
20 ?
20 i
10 ?
100 v

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i
R15
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Code: 15A04201

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B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
NETWORK ANALYSIS
(Common to ECE & EIE)

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Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

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*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Determine the voltage drop across the 10 ? resistance in the circuit shown in figure.

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(b) State maximum power transfer theorem.
(c) Distinguish between natural and forced response.
(d) Write the differences between RL and RC transient circuits.

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(e) If the phase angle ? is 45
o
, what is the power factor?
(f) Define instantaneous power and average power.
(g) Determine the resonant frequency for the circuit shown in figure below.

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(h) Illustrate the concept of mutual inductance.
(i) For a given Z
11

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=3 ?, Z
12
=1 ?, Z
21
=2 ? and Z

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22
=1 ?, find the admittance matrix and the product of ?
?
and ?
? .

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(j) For a two port network, define and relate Decibel and Neper.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

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UNIT ? I

2 By applying the superposition theorem determine the node voltage V
1
and V

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2
for the network shown
in figure.

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OR
Contd. in page 2

Page 1 of 3
R15

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20 ?
10 ?
5 ?
15 A
10 A

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A
B
~
10 ?
0.5 mH

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10 ?F
Vs
+ +
- -
1 ? 2 ? 2 ?

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2 V
1 A
2 ?
V 1 V 2
? ?

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4 V

Code: 15A04201

3 Determine the current flowing through 1.5 ? resistor in the circuit shown in figure by loop analysis.

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UNIT ? II

4 (a) A series RL circuit with R = 30 ? and L = 15H has a constant voltage V = 60V applied at t = 0 as
shown in figure below.

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Determine the current I, voltage across the resistor and inductor.
(b) In the given circuit shown in figure below, the switch k is closed at time t = 0, the steady state
condition having reached preciously. Obtain the expression for the current in the circuit at any time t.
If R
1

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= R
2
= 100 ?, ? = 10v and L = 1H, calculate at time t = 5 ms (i) Current I. (ii) Voltage drop
across R
2

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. (iii) Voltage across L.

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OR
5 (a) An RL series circuit is excited by a sinusoidal source e(t) = 10sin100t volts, by closing the switch at
t = 0. Take R = 10 ? and L = 0.1H. Determine the current i(t) flowing through the RL circuit.

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(b) For the circuit shown in figure below, find the current equation when the switch is opened at t = 0.

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Contd. in page 3

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Page 2 of 3
2 ? 2 ? 6 ?

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1 ?
8 ?
1.5 ?
10 ?
I

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20 A
30 A
60 v
15 H
30 ?

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s
i
R 1
R 2
L

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K
+
-
10 ?
2 ?F

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20 ?
20 i
10 ?
100 v
i

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R15

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Code: 15A04201

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UNIT ? III

6 With necessary derivations, illustrate the concept of instantaneous power, average power, apparent
power and reactive power.
OR

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7 (a) For the circuit shown in figure below, find:
(i) Real power dissipated by each element.
(ii) The total apparent power supplied by the circuit.
(iii) The power factor of the circuit

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(b) Two impedances ? 1
= 10 ? ? 60? ? and ? 2
= 10 ? ? 70? ? are in series and pass an effective current
of 5A. Determine the active power, reactive power, apparent power and power factor.

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UNIT ? IV

8 (a) Find the value of L at which the circuit resonates at a frequency of 1000 rad/sec in the circuit shown
in figure below.

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(b) A 50 ? resistor is connected in series with an inductor having internal resistance, a capacitor and
100 V variable frequency supply as shown in figure below. At a frequency of 200 Hz, a maximum
current of 0.7A flows through the circuit and voltage across the capacitor is 200 V. Determine the
circuit constants.

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OR

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9 (a) Derive the relation between bandwidth and quality factor.
(b) Analyze ideal transformer circuits.

UNIT ? V

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10 Derive the Z-parameters of two port network. Relate Y, h and ABCD parameters with Z-parameter.
OR
11 (a) Derive the characteristic impedance of T-network.
(b) Design a low pass filter (both ? and T sections) having cut off frequency of 2 kHz to operate with a
load resistance of 500 ?.

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*****

Page 3 of 3
20 ? 50 ?

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10 ?
- j 40 ?
120 ?30
o
v j 30 ?

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V 1 V 2
10 ? 5 ?
- j 12 ?
L
?

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?
50 ?
100 V
R + j x L
- j x e

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~
R15
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