EE6701-High-Voltage-Engineering.pdf - QUESTION BANK SUBJECT...

QUESTION BANK
SUBJECT :
EE6701 HIGH VOLTAGE ENGINEERING
SEM / YEAR: VII/IV
UNIT I -
INTRODUCTION
SYLLABUS
Causes of over voltages and its effects on power system – Lightning, switching surges and
temporary over voltages, Corona and its effects – Reflection and Refraction of Travelling
waves- Protection against overvoltage.
PART - A
Q.NO
Questions
BT Level Competence
1. Discuss different kinds of over voltages and its causes.
1 Remember
2. Define corona critical Disruptive voltage
1 Remember
3. Define lightning phenomenon
1 Remember
4. Define Isokeraunic level and back flash over
2 Understand
5. List out various schemes of protection against over voltages
2 Apply
6. Define Shielding angle.
2 Understand
7. List the techniques to be adopted for controlling switching
2 Evaluate
over voltages?
8.
Infer the concept of switching surge? Mention its approximate
1 Apply
magnitude and frequency.
9.
What are the methods employed for protection of over head
1 Apply
lines against lightning
10. Draw the mathematical model of lightning.
1 Remember
11. State the specifications of a travelling wave?
3 Analyze
12. Define surge impedance of a line?
3 Remember
13.
Outline the concept you understand from the word “travelling
3 Analyze
waves?
14. Define attenuation? How they are caused
4 Analyze
15. List the origin of switching surges?
4 Evaluate
16.
List the causes of power frequency over voltages in power
4 Understand
system?
17. Mention the specifications of the standard impulse voltage?
6 Create
18.
Express the equations for reflection coefficient and refraction
5 Understand
co- efficient

19. Draw the typical wave shape of switching surges.
5 Create
20. What is the use of protective devices?
6 Remember
PART - B
1.
Explore the mechanism of lightning and mathematical model
2
Evaluate
of lightning.
2.
Explain the different theories of charge formation in the
3
Apply
cloud.
3.
Explain the various protection of transmission line against
1 Evaluate
different over voltages.
4.
Explain various causes of power frequency over voltages in
1 Remember
power systems and its control techniques.
5.
Derive the expression for velocity of travelling waves on
3 Remember
transmission line
6.
Discuss elaborately on reflection and refraction of travelling 2
Understand
waves
7. Explain the control measures for over voltage due to
2
Analyze
Switching surge and lightning over voltages.
8. Give the origin and characteristics of switching surges and
4
Understand
explain the causes of over voltage due to switching surges in
EHV and UHV system
9. What are the causes for switching and power frequency over
4
Apply
voltages? How are they Controlled in power systems?
10. Write short notes on: (a) Rod gaps used as protective devices
1
Create
(b) Ground wires for protection of overhead lines
11.