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Code: 15A02201
B.Tech I Year II Semester (R15) Supplementary Examinations November 2017
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) Define Kirchhoff?s law.
(b) What is the significance of coefficient of coupling in a magnetic circuit?
(c) Draw voltage, current and power waveforms for pure capacitive circuit.
(d) Draw phasor diagram for simple RL series circuit.
(e) Define Q factor.
(f) Draw simple Locus diagram for series RC circuit with R (variable parameter).
(g) Define maximum power transfer theorem for sinusoidal excitation.
(h) State Thevenin?s theorem.
(i) Define H ? parameters.
(j) What is the condition of reciprocity and symmetry in Y ? parameters?
PART ? B
(Answer all five units, 5 X 10 = 50 Marks)
UNIT ? I
2 A bridge network ABCD has AB = 6 , BC = 12 , CD = 10 and DA = 3 . The galvanometer of
resistance 20 is connected between B and D and battery of emf 2 V and negligible internal resistance
is connected between A and C. Calculate the current in the galvanometer.
OR
3 (a) An iron ring of mean length 40 cm has an air gap of 2 mm and a winding of 300 turns. If the permeability
of the iron core is 300, when a current of 1A flows through the coil, find the flux density.
(b) Define Faraday?s laws of electromagnetic induction.
UNIT ? II
4 (a) In a series circuit, the voltage, current is given by , .
Calculate value of the circuit elements and calculate active, reactive and apparent power.
(b) Define form factor and crest factor.
OR
5 (a) Show that the power through pure capacitor when excited with is zero.
(b) A constant current of 5 A flows for 0.04 seconds and to complete the cycle, a constant current of 2 A
flows in the opposite direction for 0.06 seconds. Sketch the waveform of current over one cycle and
calculate: (i) Mean value of the current. (ii) The r.m.s value of the current.
UNIT ? III
6 A 10 mH coil is connected in series with a loss free capacitor to a variable frequency source which
supplies a constant voltage of 10 V. The circuit current has a maximum value of 0.2 A at frequency of
50 kHz. Calculate: (i) The capacitance of the capacitor. (ii) The Q factor of the coil. (iii) The half-power
frequencies.
OR
7 Draw Locus diagrams for parallel RLC circuit with all parameter variations.
Contd. in page 2
Page 1 of 2
R15
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Code: 15A02201
B.Tech I Year II Semester (R15) Supplementary Examinations November 2017
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) Define Kirchhoff?s law.
(b) What is the significance of coefficient of coupling in a magnetic circuit?
(c) Draw voltage, current and power waveforms for pure capacitive circuit.
(d) Draw phasor diagram for simple RL series circuit.
(e) Define Q factor.
(f) Draw simple Locus diagram for series RC circuit with R (variable parameter).
(g) Define maximum power transfer theorem for sinusoidal excitation.
(h) State Thevenin?s theorem.
(i) Define H ? parameters.
(j) What is the condition of reciprocity and symmetry in Y ? parameters?
PART ? B
(Answer all five units, 5 X 10 = 50 Marks)
UNIT ? I
2 A bridge network ABCD has AB = 6 , BC = 12 , CD = 10 and DA = 3 . The galvanometer of
resistance 20 is connected between B and D and battery of emf 2 V and negligible internal resistance
is connected between A and C. Calculate the current in the galvanometer.
OR
3 (a) An iron ring of mean length 40 cm has an air gap of 2 mm and a winding of 300 turns. If the permeability
of the iron core is 300, when a current of 1A flows through the coil, find the flux density.
(b) Define Faraday?s laws of electromagnetic induction.
UNIT ? II
4 (a) In a series circuit, the voltage, current is given by , .
Calculate value of the circuit elements and calculate active, reactive and apparent power.
(b) Define form factor and crest factor.
OR
5 (a) Show that the power through pure capacitor when excited with is zero.
(b) A constant current of 5 A flows for 0.04 seconds and to complete the cycle, a constant current of 2 A
flows in the opposite direction for 0.06 seconds. Sketch the waveform of current over one cycle and
calculate: (i) Mean value of the current. (ii) The r.m.s value of the current.
UNIT ? III
6 A 10 mH coil is connected in series with a loss free capacitor to a variable frequency source which
supplies a constant voltage of 10 V. The circuit current has a maximum value of 0.2 A at frequency of
50 kHz. Calculate: (i) The capacitance of the capacitor. (ii) The Q factor of the coil. (iii) The half-power
frequencies.
OR
7 Draw Locus diagrams for parallel RLC circuit with all parameter variations.
Contd. in page 2
Page 1 of 2
R15
Code: 15A02201
UNIT ? IV
8 Obtain the Thevenin?s equivalent circuit at terminals a-b of the network shown in below.
OR
9 State and prove maximum power transfer theorem for both AC and DC networks.
UNIT ? V
10 Derive the relationship between hybrid parameters and impedance parameters.
OR
11 Determine the transmission parameters for the given network.
*****
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R15
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This post was last modified on 11 September 2020