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Code: 15A02201
B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
ELECTRICAL CIRCUITS ? I
(Electrical & Electronics Engineering)
Time: 3 hours Max. Marks: 70
PART ? A
(Compulsory Question)
*****
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.
(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
give critical damping.
(g) A load is connected to a network of the terminals to which load is connected, R
th
= 10? and
V
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
= 8I
1
+ 6I
2
and V
2
= 10I
1
+ 6I
2
. Find the transmission
parameters A and C.
(j) When a two port network is said to be reciprocal?
PART ? B
(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
M and N.
OR
3 For the circuit shown below, determine the current supplied by the 12 V d.c source.
Contd. in page 2
Page 1 of 2
R15
4 ?
4 ?
4 ?
4 ?
4 ?
4 ?
4 ?
R
1
R
2
R
6
R
3
R
4
R
5
R
7
12 volts
+
-
?A
?A
M
N
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Code: 15A02201
B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
ELECTRICAL CIRCUITS ? I
(Electrical & Electronics Engineering)
Time: 3 hours Max. Marks: 70
PART ? A
(Compulsory Question)
*****
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.
(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
give critical damping.
(g) A load is connected to a network of the terminals to which load is connected, R
th
= 10? and
V
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
= 8I
1
+ 6I
2
and V
2
= 10I
1
+ 6I
2
. Find the transmission
parameters A and C.
(j) When a two port network is said to be reciprocal?
PART ? B
(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
M and N.
OR
3 For the circuit shown below, determine the current supplied by the 12 V d.c source.
Contd. in page 2
Page 1 of 2
R15
4 ?
4 ?
4 ?
4 ?
4 ?
4 ?
4 ?
R
1
R
2
R
6
R
3
R
4
R
5
R
7
12 volts
+
-
?A
?A
M
N
Code: 15A02201
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.
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.
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.
OR
7 Derive the expression for resonant frequency and bandwidth for a series RLC resonant circuit.
UNIT ? IV
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.
UNIT ? V
10 Obtain the admittance parameters of the network shown in figure below.
OR
11 Find the h-parameter for the network shown below.
*****
Page 2 of 2
R15
5 ? 3 ?
2 ?
20 V
10 V
A
B
2 ?
4 ?
4 ? 6 ?
10 ?
12 V 10 V
A
B
5 ?
5 ?
5H
1
1
I
2
I
2
1 2
1
I
2
I
4 ?
6 ?
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This post was last modified on 11 September 2020