Download JNTUA B.Tech 1-2 R15 2016 Dec Supple 15A02201 Electrical Circuits I Question Paper

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(Electrical & Electronics Engineering)

Time: 3 hours Max. Marks: 70

PART - A

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(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Distinguish between dependent and independent energy sources.

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(b) A battery has an internal resistance of 0.5 ohms and open circuit voltage of 12 V. What is the power
loss within the battery and the terminal voltage on full load if a resistance of 3 ohms is connected
across the terminals of the battery?
(c) Write down the values of average value, R.M.S value, form factor and peak factor of a sinusoidal
wave whose frequency is 50 Hz.

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(d) Find the RMS and average values of the waveform shown below.

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(e) A resonating series circuit has 10 resistance. If the supply is 10 V, obtain the power at half power
frequency.
(f) Define Q factor of parallel resonating circuit.
(g) In the figure shown below find by KVL. Assume in the dependent voltage source.

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(h) In a two port network, what are called input and output driving point admittances?
(i) Write down the Z parameters in terms of ABCD parameters.
(j) Represent a Two Port Network in T and ? sections.

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

UNIT - I

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2 Using node analysis, find the current flowing through the resistors.

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OR
3 A mild steel ring of circumference 50 cm and cross sectional area of 5 cm
2

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has a coil of 250 turns
wound around it. Calculate: (a) The reluctance. (b) The current required to produce a flux of 700 mWb.
The relative permeability .
Contd. in page 2
Page 1 of 3

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R15
2 1 3 4 5 6 t
V

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a
b
c d

+

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+
-
-
10
50 V

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b
a
5 A
2 A

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2
2 1
1
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Code: 15A02201

B.Tech I Year II Semester (R15) Supplementary Examinations December 2016
ELECTRICAL CIRCUITS - I
(Electrical & Electronics Engineering)

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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) Distinguish between dependent and independent energy sources.
(b) A battery has an internal resistance of 0.5 ohms and open circuit voltage of 12 V. What is the power

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loss within the battery and the terminal voltage on full load if a resistance of 3 ohms is connected
across the terminals of the battery?
(c) Write down the values of average value, R.M.S value, form factor and peak factor of a sinusoidal
wave whose frequency is 50 Hz.
(d) Find the RMS and average values of the waveform shown below.

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(e) A resonating series circuit has 10 resistance. If the supply is 10 V, obtain the power at half power
frequency.
(f) Define Q factor of parallel resonating circuit.
(g) In the figure shown below find by KVL. Assume in the dependent voltage source.

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(h) In a two port network, what are called input and output driving point admittances?
(i) Write down the Z parameters in terms of ABCD parameters.
(j) Represent a Two Port Network in T and ? sections.

PART - B

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

UNIT - I

2 Using node analysis, find the current flowing through the resistors.

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OR
3 A mild steel ring of circumference 50 cm and cross sectional area of 5 cm
2
has a coil of 250 turns

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wound around it. Calculate: (a) The reluctance. (b) The current required to produce a flux of 700 mWb.
The relative permeability .
Contd. in page 2
Page 1 of 3

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R15
2 1 3 4 5 6 t
V
a

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b
c d

+
+

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-
-
10
50 V
b

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a
5 A
2 A

2

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2 1
1

Code: 15A02201

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UNIT - II

4 Determine the value of the voltage source and power factor in the given network if it delivers a power
of 100 W to the circuit shown below. Find also the reactive power drawn from the source.

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OR
5 In the circuit shown below, determine the equivalent impedance.

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UNIT - III

6 Derive the circle equation for an RL circuit and draw the locus diagram.
OR

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7 For the given circuit, determine the value of Q at resonance and bandwidth.

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UNIT - IV

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8 Find the power loss in 5 resistor by superposition theorem.

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OR
9 Find the current in the 6 resistor in the figure below, using Thevenin?s theorem. Verify the result

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using Norton?s theorem.

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Contd. in page 3

Page 2 of 3

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R15
5 2
-j 5

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j 2


5
1

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2
j 3
-j 4
j 10

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10
90
5 H
10 V

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100
10 V
2 A
1
5

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4
+
+ -
-
+ -

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6
1
2 V
3 A

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+
+ -
-
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Code: 15A02201

B.Tech I Year II Semester (R15) Supplementary Examinations December 2016
ELECTRICAL CIRCUITS - I
(Electrical & Electronics Engineering)

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

Time: 3 hours Max. Marks: 70

PART - A
(Compulsory Question)

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

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Distinguish between dependent and independent energy sources.
(b) A battery has an internal resistance of 0.5 ohms and open circuit voltage of 12 V. What is the power

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

loss within the battery and the terminal voltage on full load if a resistance of 3 ohms is connected
across the terminals of the battery?
(c) Write down the values of average value, R.M.S value, form factor and peak factor of a sinusoidal
wave whose frequency is 50 Hz.
(d) Find the RMS and average values of the waveform shown below.

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

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

(e) A resonating series circuit has 10 resistance. If the supply is 10 V, obtain the power at half power
frequency.
(f) Define Q factor of parallel resonating circuit.
(g) In the figure shown below find by KVL. Assume in the dependent voltage source.

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

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

(h) In a two port network, what are called input and output driving point admittances?
(i) Write down the Z parameters in terms of ABCD parameters.
(j) Represent a Two Port Network in T and ? sections.

PART - B

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

UNIT - I

2 Using node analysis, find the current flowing through the resistors.

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

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

OR
3 A mild steel ring of circumference 50 cm and cross sectional area of 5 cm
2
has a coil of 250 turns

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wound around it. Calculate: (a) The reluctance. (b) The current required to produce a flux of 700 mWb.
The relative permeability .
Contd. in page 2
Page 1 of 3

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R15
2 1 3 4 5 6 t
V
a

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b
c d

+
+

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-
-
10
50 V
b

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a
5 A
2 A

2

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2 1
1

Code: 15A02201

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UNIT - II

4 Determine the value of the voltage source and power factor in the given network if it delivers a power
of 100 W to the circuit shown below. Find also the reactive power drawn from the source.

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

OR
5 In the circuit shown below, determine the equivalent impedance.

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UNIT - III

6 Derive the circle equation for an RL circuit and draw the locus diagram.
OR

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7 For the given circuit, determine the value of Q at resonance and bandwidth.

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UNIT - IV

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8 Find the power loss in 5 resistor by superposition theorem.

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OR
9 Find the current in the 6 resistor in the figure below, using Thevenin?s theorem. Verify the result

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using Norton?s theorem.

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Contd. in page 3

Page 2 of 3

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R15
5 2
-j 5

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j 2


5
1

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2
j 3
-j 4
j 10

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10
90
5 H
10 V

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100
10 V
2 A
1
5

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4
+
+ -
-
+ -

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6
1
2 V
3 A

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+
+ -
-

Code: 15A02201

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UNIT - V

10 The following readings are obtained experimentally for an unknown two-port network.
V

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1
V
2

Output open 100 V 60 V 10 A 0

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Input open 30 V 40 V 0 3 A
Compute the Z parameters.
OR
11 On short circuit test, the currents and voltages were determined experimentally for an unknown two
port network as;

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Determine the Y parameters and draw the y parameter model.

*****

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Page 3 of 3
R15
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