# Download JNTUA B.Tech 1-1 R13 2017 Dec Supply 13A02101 Electrical Circuits Question Paper

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Code: 13A02101

B.Tech I Year (R13) Supplementary Examinations December 2017
ELECTRICAL CIRCUITS
(Electrical & Electronics Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Mention any two similarities between electrical and magnetic circuits.
(b) Highlight the difference between independent and dependent sources.
(c) An electric circuit carries a current of 10 Sin (373.2t-15
0
) by the emf excitation 200 Sin(373.2t-30
0
). Find
the frequency and power factor.
(d) Show the circuit set-up for measuring active power in a 3-phase circuit using two watt meters.
(e) Why the series and parallel resonant circuits are called acceptor and rejecter circuits respectively?
(f) Differentiate Planar and Non-Planar Graphs with examples.
(g) State Reciprocity and Compensation theorems.
(h) Show the equivalent circuit of two port network governed by open circuit impedance parameters.
(i) Why does Inductor does not allow changes in currents?
(j) Write down the time constants of RL and RC circuits.

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

UNIT ? I

2 (a) A current i(t) shown below is made to pass through a pure inductance 20mH. Draw the voltage profile
and indicate the voltages.

(b) Derive the expression for equivalent inductance between two parallel connected magnetically coupled
inductances when they: (i) Aid. (ii) Oppose.
OR
3 (a) A 4 mF capacitor has the current wave form shown below. Assuming that v(0) = 10 V, Sketch the voltage
waveform v(t).

(b) Explain Faraday?s Laws of electromagnetic induction in detail.
Contd. in page 2

Page 1 of 3

R13
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Code: 13A02101

B.Tech I Year (R13) Supplementary Examinations December 2017
ELECTRICAL CIRCUITS
(Electrical & Electronics Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Mention any two similarities between electrical and magnetic circuits.
(b) Highlight the difference between independent and dependent sources.
(c) An electric circuit carries a current of 10 Sin (373.2t-15
0
) by the emf excitation 200 Sin(373.2t-30
0
). Find
the frequency and power factor.
(d) Show the circuit set-up for measuring active power in a 3-phase circuit using two watt meters.
(e) Why the series and parallel resonant circuits are called acceptor and rejecter circuits respectively?
(f) Differentiate Planar and Non-Planar Graphs with examples.
(g) State Reciprocity and Compensation theorems.
(h) Show the equivalent circuit of two port network governed by open circuit impedance parameters.
(i) Why does Inductor does not allow changes in currents?
(j) Write down the time constants of RL and RC circuits.

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

UNIT ? I

2 (a) A current i(t) shown below is made to pass through a pure inductance 20mH. Draw the voltage profile
and indicate the voltages.

(b) Derive the expression for equivalent inductance between two parallel connected magnetically coupled
inductances when they: (i) Aid. (ii) Oppose.
OR
3 (a) A 4 mF capacitor has the current wave form shown below. Assuming that v(0) = 10 V, Sketch the voltage
waveform v(t).

(b) Explain Faraday?s Laws of electromagnetic induction in detail.
Contd. in page 2

Page 1 of 3

R13
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Code: 13A02101

UNIT ? II

4 (a) Find the form factor for the following periodic wave.

(b) Explain how total reactive power consumption is measured in a 3-phase circuit using single wattmeter
with the help of phasor diagram.
OR
5 (a) The voltage across the capacitor is given by v
c
(t) = 100 Cos(500t+45
0
). Find v
s
(t) and i(t).

(b) The input power to a three phase load is 10 kW at 0.8 power factor. Two watt meters are connected to
measure this power. Find individual readings of the watt meters.

UNIT ? III

6 (a) A resistance of 100 ohms, inductance of 5H and capacitance of 100 ?F connected in series and supplied
with an AC source of voltage 10 V. Find: (i) Resonant frequency. (ii) Band width. (iii) Current at
resonance. (iv) Q-factor. (v) Voltage magnification ratio.
(b) Explain the importance of Incidence matrix with help of suitable example.
OR
7 (a) A 50 ohms variable resistance is connected in series with a pure inductance of reactance 25 ohms (fixed
value) and excited by a 200 V, 50 Hz supply. Plot the Locus diagram of current and mark the range of
current for maximum and minimum values of resistance. Also find maximum power consumed in the
circuit and the corresponding current and power factor.
(b) Write short notes on Graph, Tree and Link with examples.

UNIT ? IV

8 (a) Find the current flowing through load resistance using Thevinin?s theorem for R
L
values of 6 ohms and 16
ohms.

(b) Inter relate different parameters of two port network and explain.
OR
Contd. in page 3

Page 2 of 3

R13
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www.FirstRanker.com

Code: 13A02101

B.Tech I Year (R13) Supplementary Examinations December 2017
ELECTRICAL CIRCUITS
(Electrical & Electronics Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Mention any two similarities between electrical and magnetic circuits.
(b) Highlight the difference between independent and dependent sources.
(c) An electric circuit carries a current of 10 Sin (373.2t-15
0
) by the emf excitation 200 Sin(373.2t-30
0
). Find
the frequency and power factor.
(d) Show the circuit set-up for measuring active power in a 3-phase circuit using two watt meters.
(e) Why the series and parallel resonant circuits are called acceptor and rejecter circuits respectively?
(f) Differentiate Planar and Non-Planar Graphs with examples.
(g) State Reciprocity and Compensation theorems.
(h) Show the equivalent circuit of two port network governed by open circuit impedance parameters.
(i) Why does Inductor does not allow changes in currents?
(j) Write down the time constants of RL and RC circuits.

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

UNIT ? I

2 (a) A current i(t) shown below is made to pass through a pure inductance 20mH. Draw the voltage profile
and indicate the voltages.

(b) Derive the expression for equivalent inductance between two parallel connected magnetically coupled
inductances when they: (i) Aid. (ii) Oppose.
OR
3 (a) A 4 mF capacitor has the current wave form shown below. Assuming that v(0) = 10 V, Sketch the voltage
waveform v(t).

(b) Explain Faraday?s Laws of electromagnetic induction in detail.
Contd. in page 2

Page 1 of 3

R13
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www.FirstRanker.com

Code: 13A02101

UNIT ? II

4 (a) Find the form factor for the following periodic wave.

(b) Explain how total reactive power consumption is measured in a 3-phase circuit using single wattmeter
with the help of phasor diagram.
OR
5 (a) The voltage across the capacitor is given by v
c
(t) = 100 Cos(500t+45
0
). Find v
s
(t) and i(t).

(b) The input power to a three phase load is 10 kW at 0.8 power factor. Two watt meters are connected to
measure this power. Find individual readings of the watt meters.

UNIT ? III

6 (a) A resistance of 100 ohms, inductance of 5H and capacitance of 100 ?F connected in series and supplied
with an AC source of voltage 10 V. Find: (i) Resonant frequency. (ii) Band width. (iii) Current at
resonance. (iv) Q-factor. (v) Voltage magnification ratio.
(b) Explain the importance of Incidence matrix with help of suitable example.
OR
7 (a) A 50 ohms variable resistance is connected in series with a pure inductance of reactance 25 ohms (fixed
value) and excited by a 200 V, 50 Hz supply. Plot the Locus diagram of current and mark the range of
current for maximum and minimum values of resistance. Also find maximum power consumed in the
circuit and the corresponding current and power factor.
(b) Write short notes on Graph, Tree and Link with examples.

UNIT ? IV

8 (a) Find the current flowing through load resistance using Thevinin?s theorem for R
L
values of 6 ohms and 16
ohms.

(b) Inter relate different parameters of two port network and explain.
OR
Contd. in page 3

Page 2 of 3

R13
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Code: 13A02101

9 (a) Explain the superposition theorem with suitable example.
(b) Find the h parameters of the network shown below.

UNIT ? V

10 A series RLC circuit having 10 ohms resistance, 0.5H inductance and 200 ?F capacitance is to be excited
by a sinusoidal voltage V = 150 Sin(200t+?) by a switch. If the switch is closed when ? = 30
0
, obtain the
current equation.
OR
11 Find the trigonometric Fourier Series for the wave form shown below and plot the spectrum.

*****

Page 3 of 3
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