Download JNTUA B.Tech 1-2 R15 2019 Dec Supple 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) By using source transformation, convert the circuit shown in figure below into a single voltage
source and single resistance.

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(b) In the circuit shown in figure below, determine the value of load resistance when the load resistance
draws maximum power. Also find the value of maximum power.

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(c) Define transient time and transient response.
(d) What are critical frequencies? Why are they so called?
(e) Determine the average power delivered to the circuit consisting of an impedance z=5+j8 when the
current flowing through the circuit is I=5 ?30
o

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A.
(f) Illustrate the power triangle.
(g) For the circuit shown in figure below, determine the value of capacitive reactance and impedance at
resonance.

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(h) For the circuit shown in figure below, determine the value of Q at resonance and bandwidth of the

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circuit.

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(i) Write the transmission parameters.
(j) Relate the characteristic impedance of T and ? network.
Contd. in page 2

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Page 1 of 4

R15

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?
?
+
-
2 ?

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2 ?
3 ?
2 ?
1 ?
10 v

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A
B
?
?
50 v

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+
-
25 ?
I
10 A 5 A

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50 ?
~
+j 25 ? -j X e
V s
~

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90 ?
100 ?F
10 ?
5 H
10v

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FirstRanker.com - FirstRanker's Choice

Code: 15A04201

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

Time: 3 hours Max. Marks: 70

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PART ? A
(Compulsory Question)

*****

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1 Answer the following: (10 X 02 = 20 Marks)
(a) By using source transformation, convert the circuit shown in figure below into a single voltage
source and single resistance.

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(b) In the circuit shown in figure below, determine the value of load resistance when the load resistance
draws maximum power. Also find the value of maximum power.

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(c) Define transient time and transient response.
(d) What are critical frequencies? Why are they so called?
(e) Determine the average power delivered to the circuit consisting of an impedance z=5+j8 when the
current flowing through the circuit is I=5 ?30

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o
A.
(f) Illustrate the power triangle.
(g) For the circuit shown in figure below, determine the value of capacitive reactance and impedance at
resonance.

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(h) For the circuit shown in figure below, determine the value of Q at resonance and bandwidth of the
circuit.

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(i) Write the transmission parameters.
(j) Relate the characteristic impedance of T and ? network.

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Contd. in page 2


Page 1 of 4

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R15
?
?
+
-

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2 ?
2 ?
3 ?
2 ?
1 ?

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10 v
A
B
?
?

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50 v
+
-
25 ?
I

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10 A 5 A
50 ?
~
+j 25 ? -j X e
V s

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~
90 ?
100 ?F
10 ?
5 H

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10v

Code: 15A04201

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

UNIT ? I

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2 (a) State and prove Thevenin?s theorem, find R
th
and V
th
for the network shown in figure below.

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(b) Find the power delivered by 5A current source in the circuit shown in figure by using nodal method.

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OR
3 (a) Use mesh analysis to find V
x
in the circuit shown in figure below.

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(b) Find the current through various branches of the circuit shown in figure below by employing the

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superposition theorem.

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Contd. in page 3

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Page 2 of 4


?

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?
2 ?
6 ?
8 ?
8 v

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10 v
1 ?
3 ? 6 V
1 ?
1 ?

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10 v
+ -
3 ? 1 ?
2 ?
2A

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3A
5 ?
-
-
-

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-
+
+
+
+

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16.67 ? 33.33 ?
0.45 A
25 ?
10 V
30 V

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2 v x
v x
10 ? 5 ?
10 ?
50 V

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5A
R15
+
-
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Code: 15A04201


B.Tech I Year II Semester (R15) Supplementary Examinations December 2019

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NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

--- Content provided by FirstRanker.com ---

PART ? A
(Compulsory Question)

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

--- Content provided by⁠ FirstRanker.com ---

(a) By using source transformation, convert the circuit shown in figure below into a single voltage
source and single resistance.

--- Content provided by​ FirstRanker.com ---

(b) In the circuit shown in figure below, determine the value of load resistance when the load resistance
draws maximum power. Also find the value of maximum power.

--- Content provided by​ FirstRanker.com ---

--- Content provided by‍ FirstRanker.com ---

(c) Define transient time and transient response.
(d) What are critical frequencies? Why are they so called?
(e) Determine the average power delivered to the circuit consisting of an impedance z=5+j8 when the
current flowing through the circuit is I=5 ?30
o

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A.
(f) Illustrate the power triangle.
(g) For the circuit shown in figure below, determine the value of capacitive reactance and impedance at
resonance.

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(h) For the circuit shown in figure below, determine the value of Q at resonance and bandwidth of the

--- Content provided by‍ FirstRanker.com ---

circuit.

--- Content provided by‍ FirstRanker.com ---

(i) Write the transmission parameters.
(j) Relate the characteristic impedance of T and ? network.
Contd. in page 2

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Page 1 of 4

R15

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?
?
+
-
2 ?

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2 ?
3 ?
2 ?
1 ?
10 v

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A
B
?
?
50 v

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+
-
25 ?
I
10 A 5 A

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50 ?
~
+j 25 ? -j X e
V s
~

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90 ?
100 ?F
10 ?
5 H
10v

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Code: 15A04201


PART ? B

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

UNIT ? I

2 (a) State and prove Thevenin?s theorem, find R

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th
and V
th
for the network shown in figure below.

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(b) Find the power delivered by 5A current source in the circuit shown in figure by using nodal method.

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OR
3 (a) Use mesh analysis to find V
x
in the circuit shown in figure below.

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(b) Find the current through various branches of the circuit shown in figure below by employing the
superposition theorem.

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Contd. in page 3

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Page 2 of 4


?
?

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2 ?
6 ?
8 ?
8 v
10 v

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1 ?
3 ? 6 V
1 ?
1 ?
10 v

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+ -
3 ? 1 ?
2 ?
2A
3A

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5 ?
-
-
-
-

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+
+
+
+
16.67 ? 33.33 ?

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0.45 A
25 ?
10 V
30 V
2 v x

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v x
10 ? 5 ?
10 ?
50 V
5A

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R15
+
-

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Code: 15A04201

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UNIT ? II

4 (a) Derive the DC response of an RC circuit. Also derive the voltage across the capacitor and resistor.
Draw its responses.

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(b) For the above circuit, consider R = 10 ?, C = 0.1F and a constant voltage of 20 V is applied to the
circuit at t = 0. Obtain the current equation, voltage across the capacitor and resistor.
OR
5 (a) The switch in the circuit shown in figure below is closed at t = 0. Find V
2

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(t) for all t ? 0 by time
domain method. Assume zero initial current in the inductance.

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(b) For the circuit shown in figure below, find the current in the 20 ? when the switch is opened at t=0.

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UNIT ? III

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6 (a) For the circuit shown in figure below, a voltage of 250 sin ? ? is applied. Determine the power factor
of the circuit.

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(b) A series RL circuit draws a current of ? ( ? ) = 8 sin(50 ? + 45?) from the source. Determine the circuit

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constants, if the power delivered by the source is 100w and there is a lagging power factor of 0.707.
OR
7 (a) What is the relation between bandwidth and resonant frequency?
(b) An inductance of 0.5H a resistance of 5 ? and a capacitance of 8 ?F are in series across a 220 V AC
supply. Calculate the frequency at which the circuit resonates. Find the current at resonance

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bandwidth, half power frequencies and the voltage across capacitance of resonance.



Contd. in page 4

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Page 3 of 4

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+
-
30 ?
10 ?
0.2 H

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10 V
V 2(t)
30 ?
50 V
i

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+
- 2H
20 ?
?
?

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10 i
?
R L
C
5A

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A
V 1
V 2 V 3
~
250 sin ?t

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100 V
125 V
150 V
R15
FirstRanker.com - FirstRanker's Choice

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Code: 15A04201


B.Tech I Year II Semester (R15) Supplementary Examinations December 2019

--- Content provided by‌ FirstRanker.com ---

NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

--- Content provided by​ FirstRanker.com ---

PART ? A
(Compulsory Question)

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

--- Content provided by​ FirstRanker.com ---

(a) By using source transformation, convert the circuit shown in figure below into a single voltage
source and single resistance.

--- Content provided by​ FirstRanker.com ---

(b) In the circuit shown in figure below, determine the value of load resistance when the load resistance
draws maximum power. Also find the value of maximum power.

--- Content provided by‌ FirstRanker.com ---

--- Content provided by⁠ FirstRanker.com ---

(c) Define transient time and transient response.
(d) What are critical frequencies? Why are they so called?
(e) Determine the average power delivered to the circuit consisting of an impedance z=5+j8 when the
current flowing through the circuit is I=5 ?30
o

--- Content provided by‌ FirstRanker.com ---

A.
(f) Illustrate the power triangle.
(g) For the circuit shown in figure below, determine the value of capacitive reactance and impedance at
resonance.

--- Content provided by​ FirstRanker.com ---

(h) For the circuit shown in figure below, determine the value of Q at resonance and bandwidth of the

--- Content provided by FirstRanker.com ---

circuit.

--- Content provided by‌ FirstRanker.com ---

(i) Write the transmission parameters.
(j) Relate the characteristic impedance of T and ? network.
Contd. in page 2

--- Content provided by⁠ FirstRanker.com ---

Page 1 of 4

R15

--- Content provided by⁠ FirstRanker.com ---

?
?
+
-
2 ?

--- Content provided by​ FirstRanker.com ---

2 ?
3 ?
2 ?
1 ?
10 v

--- Content provided by​ FirstRanker.com ---

A
B
?
?
50 v

--- Content provided by‌ FirstRanker.com ---

+
-
25 ?
I
10 A 5 A

--- Content provided by‌ FirstRanker.com ---

50 ?
~
+j 25 ? -j X e
V s
~

--- Content provided by​ FirstRanker.com ---

90 ?
100 ?F
10 ?
5 H
10v

--- Content provided by​ FirstRanker.com ---

Code: 15A04201


PART ? B

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

UNIT ? I

2 (a) State and prove Thevenin?s theorem, find R

--- Content provided by‍ FirstRanker.com ---

th
and V
th
for the network shown in figure below.

--- Content provided by​ FirstRanker.com ---

--- Content provided by‌ FirstRanker.com ---

(b) Find the power delivered by 5A current source in the circuit shown in figure by using nodal method.

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--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

OR
3 (a) Use mesh analysis to find V
x
in the circuit shown in figure below.

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--- Content provided by‌ FirstRanker.com ---

(b) Find the current through various branches of the circuit shown in figure below by employing the
superposition theorem.

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Contd. in page 3

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Page 2 of 4


?
?

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2 ?
6 ?
8 ?
8 v
10 v

--- Content provided by FirstRanker.com ---

1 ?
3 ? 6 V
1 ?
1 ?
10 v

--- Content provided by⁠ FirstRanker.com ---

+ -
3 ? 1 ?
2 ?
2A
3A

--- Content provided by⁠ FirstRanker.com ---

5 ?
-
-
-
-

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+
+
+
+
16.67 ? 33.33 ?

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0.45 A
25 ?
10 V
30 V
2 v x

--- Content provided by​ FirstRanker.com ---

v x
10 ? 5 ?
10 ?
50 V
5A

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R15
+
-

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Code: 15A04201

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UNIT ? II

4 (a) Derive the DC response of an RC circuit. Also derive the voltage across the capacitor and resistor.
Draw its responses.

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(b) For the above circuit, consider R = 10 ?, C = 0.1F and a constant voltage of 20 V is applied to the
circuit at t = 0. Obtain the current equation, voltage across the capacitor and resistor.
OR
5 (a) The switch in the circuit shown in figure below is closed at t = 0. Find V
2

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(t) for all t ? 0 by time
domain method. Assume zero initial current in the inductance.

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(b) For the circuit shown in figure below, find the current in the 20 ? when the switch is opened at t=0.

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UNIT ? III

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6 (a) For the circuit shown in figure below, a voltage of 250 sin ? ? is applied. Determine the power factor
of the circuit.

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(b) A series RL circuit draws a current of ? ( ? ) = 8 sin(50 ? + 45?) from the source. Determine the circuit

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constants, if the power delivered by the source is 100w and there is a lagging power factor of 0.707.
OR
7 (a) What is the relation between bandwidth and resonant frequency?
(b) An inductance of 0.5H a resistance of 5 ? and a capacitance of 8 ?F are in series across a 220 V AC
supply. Calculate the frequency at which the circuit resonates. Find the current at resonance

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bandwidth, half power frequencies and the voltage across capacitance of resonance.



Contd. in page 4

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Page 3 of 4

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+
-
30 ?
10 ?
0.2 H

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10 V
V 2(t)
30 ?
50 V
i

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+
- 2H
20 ?
?
?

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10 i
?
R L
C
5A

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A
V 1
V 2 V 3
~
250 sin ?t

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100 V
125 V
150 V
R15

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Code: 15A04201

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UNIT ? IV

8 (a) Determine the impedance at resonant frequency, 10 Hz above resonant frequency and 10 Hz below

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resonant frequency for the circuit shown in figure below.

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(b) Derive the Q-factor of a parallel resonance circuit.
OR
9 Derive the voltages of a series RLC circuit. Also derive the bandwidth of it.

UNIT ? V

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10 For the circuit shown in figure below, compute its z, y and h-parameters.

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OR

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11 (a) Design a constant k-low pass filter and high pass filter having a cutoff frequency of 1 kHz with a
load resistance of 600 ?.
(b) Draw the ideal frequency responses of low pass filter, high pass filter, Band pass and Band stop
filter.

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*****

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Page 4 of 4
R15
~
10 ?
0.1 H

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10 ?F
1 ? 2 ?
I 1
4 ?
V 2

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V 1
2 ?
I 2
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