Download JNTUA B.Tech 1-2 R15 2019 June 15A02201 Electrical Circuits I Question Paper

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ELECTRICAL CIRCUITS ? I
(Electrical & Electronics Engineering)
Time: 3 hours Max. Marks: 70
PART ? A
(Compulsory Question)

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*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) An incandescent lamp is rated for 110 V, 100 W. Using a suitable resistor how you can operate this
lamp on 220 V mains.

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(b) Define self-inductance and mutual inductance of a coil.
(c) Define form factor and peak factor.
(d) A voltage of 100 V is applied to a capacitor of 12 ?F. The current is 0.5 A. What must be the
frequency of supply?
(e) What is the resonant frequency and bandwidth of a series RLC circuit whose R = 5?, L = 40mH and

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C = 1 ?F.
(f) In a series RLC circuit, if the value of L and C are 10 mH and 0.1 ?F, determine the value of R to
give critical damping.
(g) A load is connected to a network of the terminals to which load is connected, R
th

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= 10? and
V
th
= 40 V. Calculate the maximum power supplied to the load.
(h) List the applications of Norton?s theorem.

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(i) A two port network is characterized by V
1
= 8I
1
+ 6I

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2
and V
2
= 10I
1

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+ 6I
2
. Find the transmission
parameters A and C.
(j) When a two port network is said to be reciprocal?

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

UNIT ? I

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2 For the network shown in figure below, find the equivalent resistance between the terminals
M and N.

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OR
3 For the circuit shown below, determine the current supplied by the 12 V d.c source.

Contd. in page 2

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Page 1 of 2
R15
4 ?
4 ?
4 ?

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4 ?
4 ?
4 ?
4 ?
R

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1

R
2

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R
6

R
3

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R
4

R

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5

R
7

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12 volts
+
-
?A
?A

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M
N
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Code: 15A02201

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B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
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) An incandescent lamp is rated for 110 V, 100 W. Using a suitable resistor how you can operate this
lamp on 220 V mains.
(b) Define self-inductance and mutual inductance of a coil.
(c) Define form factor and peak factor.

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(d) A voltage of 100 V is applied to a capacitor of 12 ?F. The current is 0.5 A. What must be the
frequency of supply?
(e) What is the resonant frequency and bandwidth of a series RLC circuit whose R = 5?, L = 40mH and
C = 1 ?F.
(f) In a series RLC circuit, if the value of L and C are 10 mH and 0.1 ?F, determine the value of R to

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give critical damping.
(g) A load is connected to a network of the terminals to which load is connected, R
th
= 10? and
V

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th
= 40 V. Calculate the maximum power supplied to the load.
(h) List the applications of Norton?s theorem.
(i) A two port network is characterized by V
1

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= 8I
1
+ 6I
2
and V

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2
= 10I
1
+ 6I
2

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. Find the transmission
parameters A and C.
(j) When a two port network is said to be reciprocal?

PART ? B

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

UNIT ? I

2 For the network shown in figure below, find the equivalent resistance between the terminals

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M and N.


OR
3 For the circuit shown below, determine the current supplied by the 12 V d.c source.

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Contd. in page 2

Page 1 of 2
R15

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4 ?
4 ?
4 ?
4 ?
4 ?

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4 ?
4 ?
R
1

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R
2

R
6

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R
3

R

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4

R
5

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R
7

12 volts
+

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-
?A
?A
M
N

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Code: 15A02201

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UNIT ? II

4 A 20? resistor and a 30mH inductor are connected in series across a 300 V, 50 Hz a.c supply. Find:
(i) Impedance of the circuit. (ii) Voltage across the resistor. (iii) Voltage across the inductor.
(iv) Apparent power. (v) Active power. (vi) Reactive power.

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OR
5 Two impedances (15-j10)? and (10+j15)? are connected in parallel. The supply voltage is 200 V,
50 Hz. Calculate: (i) Admittance. (ii) Conductance. (iii) Susceptance. (iv) Total current. (v) Total
power.

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UNIT ? III

6 A coil of resistance 40? and inductance 0.75H forms part of a series circuit for which the resonant
frequency is 55 c/s. If the supply is 250 V, 50 c/s. Find: (i) Line current. (ii) Power factor. (iii) Voltage
across the coil.

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OR
7 Derive the expression for resonant frequency and bandwidth for a series RLC resonant circuit.

UNIT ? IV

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8 Find the current in the 2? resistor between A and B for the network shown below using Super
Position theorem.

OR
9 Determine the current flowing through the 10? resistor by using Thevenin?s theorem.

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UNIT ? V

10 Obtain the admittance parameters of the network shown in figure below.

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OR
11 Find the h-parameter for the network shown below.

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*****
Page 2 of 2
R15
5 ? 3 ?
2 ?

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20 V
10 V
A
B
2 ?

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4 ?
4 ? 6 ?
10 ?
12 V 10 V
A

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B
5 ?
5 ?
5H
1

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1
I
2
I

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2
1 2
1
I
2

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I

4 ?
6 ?
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