Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2016-17 EEE061 Power Quality Question Paper
B.TECH.
THEORY EXAMINATION (SEM?VIII) 2016-17
POWER QUALITY
T ime : 3 Hours Max. Marks : 100
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 x 2 = 20
(a) What is Power Quality?
(b) How can Power Quality problems be detected?
(c) What are Harmonics?
(d) Mention the types of sag.
(e) What is Voltage Sag?
(1) Name the different motor starting methods
(g) Define transient over voltages
(h) What is the need of surge arrestors?
(i) Define true power factor.
(j) State the different types of inverters
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 10 = 50
(a) What would be the impact of "poor power quality" on system efficiency, reliability and
operation?
(b) Discuss the working principle of DSTATCOM. How load compensation can be done
using DSTATCOM.
(c) What are series and shunt compensator? Compare their role for power quality
improvement.
(d) What are the passive filters? Explain the factors to be considered for designing a
passive filter. Also explain their limitations.
(e) What are Power Conditioners? Explain working principle of Unified Power Quality
Conditioner (UPQC)?
(f) Distinguish between voltage sag and under voltage? Brie?y discuss the techniques used
for sag or dip mitigation.
(g) What causes voltage imbalance in a system? What are its consequences? How is it
different from voltage ?uctuation?
(h) Enumerate the devices used to check the voltage related power quality in power system.
Discuss any one of them in detail.
SECTION ? C
Attempt any two parts of the following questions: 2 x 15 = 30
3. What is the significance of neutral voltage? Under which conditions it suffers swings? What
can be done to prevent the same?
4. What do you understand by harmonics? What are different types of harmonics? Explain the
different detrimental effects of harmonics with suitable examples.
5. What are the causes of interruptions? How do short duration interruptions differ from sustained
interruptions? What is the importance of interruptions?
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This post was last modified on 30 January 2020