Exam Details
| Subject | high voltage engineering | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
HIGH VOLTAGE ENGINEERING
(Electrical and Electronics Engineering)
Date: 14 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. What are the important rules to be implemented to determine the potential
distribution over the dielectric?
6M
Explain the advantages of liquid dielectric over other dielectrics.
9M
2. What are the challenges encountered when power apparatus are tested against surge
arresters?
6M
Explain how the electric field is estimated using the potential.
9M
Unit II
3. Explain Townsend's theory of breakdown of gases. Obtain the condition for
breakdown.
10M
Define breakdown. Briefly explain ionization by collision and the factors that affect the
same.
5M
4. List and briefly explain any three ionization processes taking place in a gaseous
dielectric medium subjected to an electric stress.
9M
Obtain the value of γ at breakdown for a parallel plate electrode configuration under
uniform electric field using Paschen's law, if the gap distance is 1cm, pressure is
760torr, temperature is 300C, when breakdown voltage is 31500V. Consider
B=360/cm.
6M
Unit III
5. Sketch the arrangement of stage Cockroft-Walton voltage multiplier circuit, having
all the stage capacitances of the same value C. Explain.
9M
A ten stage Cockraft Walton circuit has all capacitors of 0.06 micro farads. The
secondary voltage of the supply transformer is 100kV at 150Hz. For a load current of
1mA, find the percentage voltage regulation and percentage ripple.
6M
6. List the main components of a multi-stage impulse voltage generator. Give two
reasons for providing controlled triggering circuit.
5M
An impulse current generator is rated for 60kW seconds. The parameters of the circuit
are, C=53 micro farads, L=1.47 micro Henry and R=0.0156Ω. Obtain the expression for
current in the circuit.
10M
Unit IV
7. How does the ground fault effects the performance of the transmission line? 7M
How the substations are protected against the direct strokes?
8M
8. Discuss the methods to control over voltages due to switching. 7M
An infinite rectangular wave on a line having a surge impedance of 500Ω strikes a
transmission line terminated with a capacitance of 0.004F. Calculate the extent to
which the wave front is retarded.
8M
Cont…2
Unit V
9. What are the different power frequency tests done on insulator? Mention the
procedure for testing.
8M
What are the various tests are conducted on transformers? Briefly explain impulse
tests carried on cables.
7M
10. What are the different power frequency tests done on bushings? Mention the
procedure for testing.
8M
Write the sequence of application of various impulse voltages applied while conducting
lightning impulse test on power transformer.
7M
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
HIGH VOLTAGE ENGINEERING
(Electrical and Electronics Engineering)
Date: 14 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. What are the important rules to be implemented to determine the potential
distribution over the dielectric?
6M
Explain the advantages of liquid dielectric over other dielectrics.
9M
2. What are the challenges encountered when power apparatus are tested against surge
arresters?
6M
Explain how the electric field is estimated using the potential.
9M
Unit II
3. Explain Townsend's theory of breakdown of gases. Obtain the condition for
breakdown.
10M
Define breakdown. Briefly explain ionization by collision and the factors that affect the
same.
5M
4. List and briefly explain any three ionization processes taking place in a gaseous
dielectric medium subjected to an electric stress.
9M
Obtain the value of γ at breakdown for a parallel plate electrode configuration under
uniform electric field using Paschen's law, if the gap distance is 1cm, pressure is
760torr, temperature is 300C, when breakdown voltage is 31500V. Consider
B=360/cm.
6M
Unit III
5. Sketch the arrangement of stage Cockroft-Walton voltage multiplier circuit, having
all the stage capacitances of the same value C. Explain.
9M
A ten stage Cockraft Walton circuit has all capacitors of 0.06 micro farads. The
secondary voltage of the supply transformer is 100kV at 150Hz. For a load current of
1mA, find the percentage voltage regulation and percentage ripple.
6M
6. List the main components of a multi-stage impulse voltage generator. Give two
reasons for providing controlled triggering circuit.
5M
An impulse current generator is rated for 60kW seconds. The parameters of the circuit
are, C=53 micro farads, L=1.47 micro Henry and R=0.0156Ω. Obtain the expression for
current in the circuit.
10M
Unit IV
7. How does the ground fault effects the performance of the transmission line? 7M
How the substations are protected against the direct strokes?
8M
8. Discuss the methods to control over voltages due to switching. 7M
An infinite rectangular wave on a line having a surge impedance of 500Ω strikes a
transmission line terminated with a capacitance of 0.004F. Calculate the extent to
which the wave front is retarded.
8M
Cont…2
Unit V
9. What are the different power frequency tests done on insulator? Mention the
procedure for testing.
8M
What are the various tests are conducted on transformers? Briefly explain impulse
tests carried on cables.
7M
10. What are the different power frequency tests done on bushings? Mention the
procedure for testing.
8M
Write the sequence of application of various impulse voltages applied while conducting
lightning impulse test on power transformer.
7M
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