EE1005 Power Quality Question Bank : kings.ac.in

Name of the College : Kings College Of Engineering
Department : Electrical & Electronics Engineering
Subject : Power Quality
Website : kings.ac.in
Document Type : Model Question Paper

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/ki…ANK%5B1%5D.pdf

Kings Power Quality Question Paper

Unit – I

Introduction To Power Quality :
Part – A :
1. What is Power Quality?(2)
2. What is the most common power quality Problem? Why has power quality only become an issue in recent years? (2)

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3. What are the types of Power quality solutions available on the market today? (2)
4. How can Power quality problems be detected? (2)
5. What are harmonics? How do harmonics affect the electrical system and load? (2)
6. What is Power conditioning and why it is needed? (2)
7. Why noise or transients on the power line causing problems now? (2)
8. Differentiate between power quality, voltage quality and current quality (2)
9. Mention any two major reasons for the increased concern in Power quality. (2)
10. What are the various power quality issues? (2)
11. What is the meaning of power quality disturbances? (2)
12. State at least two reasons for increased power quality concern. (2)
13. Define long duration variations and short duration variations. (2)
14. Define sag and swell (2)
15. Mention the types of sag and swell (2)

16. What are the causes of sags and swell? (2)
17. What condition an interruption can occurs? (2)
18. List the types of interruption and causes of interruption (2)
19. Define waveform distortion. (2)
20. What are the components of waveform distortion? (2)
21. Define total harmonic distortion and write the formula (2)
22. Define total demand distortion (2)
23. Define DC offset, Inter harmonics (2)
24. Define Voltage flicker. (2)
25. Differentiate between under voltage and over voltage (2)
26. What are the causes of over voltages under voltages? (2)
27. Differentiate between impulsive transients and oscillatory transients.(2)
28. What are the types of impulsive transients and causes of impulsive transients.(2)
29. Define voltage unbalance (2)
30. Define CBEMA curve. (2)
31. What represents ITIC curve? (2)
32. What are the main objective of power quality standards? (2)
33. List the four standards available in Power quality (2)
34. Name any two IEEE standards that define power quality. (2)
35. Name any four IEC standards that define power quality. (2)

Part – B :
1. (a)What are the major power quality issues? Explain in detail (8)
(b)Define power quality? Explain the reasons for increased concern in power quality. (8)
2. Explain the various types of power quality disturbances and impacts of power quality. (16)
3. (a)Discuss the following characteristics of power quality events
(i)Short duration variations.
(ii)Long duration variations (8)
(b)Discuss in detail about transients. (8)
4. Discuss in detail about sags and swells.(16)
5. Explain for the following related with Power quality.
(i)Voltage imbalance
(iiUnder voltage
(ii)Over voltage
(iv)Frequency variation (16)
6. Define waveform distortion? Explain the waveform distortion categories (16)
7. What is harmonics ? Explain harmonic distortion with relevant waveforms(16)
8. Explain the following :
(i)Total harmonic distortion
(ii)Total demand distortion (16)
9. (a)Write the various IEEE and IEC power quality standards. (8)
(b)Explain the following event based disturbances :
(i)Dip
(ii)Swell
(iii)Transients (8)
10.Discuss about the computer Business Equipment Manufactures Associations(CBEMA).Explain about the events described in the curve. (16)
11.With a waveform sketch, explain the terms
(i)Voltage sag
(ii)Voltage interruption
(iii)Voltage swells.
(iv)Sag with harmonics. (16)
12.Explain the following steady state disturbances.
(i)Magnitude
(ii)Unbalance
(iii)Harmonics
(iv)Flicker. (16)

Unit – II

Voltage Sags And Interruptions :
Part – A :
1. What is voltage sag. (2)
2. When sag leads interruption? What are the causes of sag? (2)
3. What is semi F47? (2)
4. What parameters should depend upon voltage sag? (2)
5. List some IEEE Standards Associated with voltage sags.(2)
6. What are the sources of sags and interruption? (2)
7. What is the importance of estimating sag performance? (2)
8. Define voltage sag analysis? (2)
9. Name the frequently used voltage sag indices. (2)
10. What are the various factors affecting the sag magnitude due to faults at a certain point in the system? (2)
11. Define voltage sags due to motor starting ? (2)
12. Name the different motor starting methods. (2)
13. How voltage sag can be mitigated? Name the three levels of possible solutions to voltage sag and momentary interruption problems (2)
14. Name any four types of sag mitigation devices.(2)
15. Define Dynamic voltage restorer? What is the important role of DVR? (2)
16. Define active series compensation devices.(2)
17. What is the need of DSTATCOM? What is the main function of DSTATCOM? (2)
18. What is the role of (advantages of )solid state (static)Transfer switch.(SSTS)? (2)
19. How fast transfer switches are used in minimizing the severity of sags? (2)

Part – B :
1. (a)Discuss the sources of sags and interruption (8)
(b)Discuss in detail about the sag performance evaluation indices.(8)
2. What is the need of estimating sag performance ?Explain the different methods of estimating voltage sag performance. (16)
3. (a)Explain the sag performance evaluation methods (8)
(b)Explain the various causes and effects of voltage sags. (8)
4. Explain the following causes of sags.
(i)Voltage sag due to motor sag
(ii)Voltage sag due to single line to ground fault.
(iii)Voltage sag due to transformer energizing. (16)
5. What are the different voltage sag mitigation techniques? Explain in details.(16)
6. (a)Explain the principle of DVR operation used for sag mitigation. (8)
(b)Discuss in detail about the active series compensator. (8)
7. (a)Explain the operation of distributed static compensator (DSTATCOM)used for sag mitigation. (8)
(b)Explain the solid state transfer switch with the transfer operation.(8)
8. (a)Explain the procedure for estimating the sag severity indices.(8)
(b)Mention the standards associated with the voltage sag.(8)
9. Explain the system adapted to estimate the severity of the sag occurred due to various sources.(16)
10. Explain the following sag mitigation techniques.
(i)Static UPS with minimal energy storage
(ii)Backup storage energy supply
( iii)Flywheel with UPS system. (16)
11.Discuss about estimating the cost of voltage sag events.(16)