Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 7th Sem 71942 Power Quality Monitoring And Conditioning Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(EE) (2012 Onwards E-III) (Sem.?7)
POWER QUALITY MONITORING AND CONDITIONING
Subject Code : BTEE-805A
M.Code : 71942
Time : 3 Hrs. Max. Marks : 60
INST RUCT ION TO CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
What are the different sources of pollution in power system?
2.
Write short note on : SMPS.
3.
What are odd and even harmonics?
4.
What is difference between rms and average value?
5.
Write short notes on: CT and PT.
6.
What is difference between THD and individual harmonic distortion?
7.
Explain the term Voltage Sag with an example. How magnitude of voltage sag can be
determined?
8.
Define the terms blackout and outage.
9.
Assume that the RMS value of the third harmonic current in a nonlinear load is 20 A, the
RMS value of the fifth harmonic current is 15 A, and the RMS value of the fundamental is
60 A. Calculate what is the individual third harmonic distortion.
10. What is Fourier analysis?
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SECTION-B
11. Explain these terms (any two) with suitable examples :
a. Rectifier
b. Transients
c. Interruptions
12. Explain the voltage swell, voltage sag energy index, rms and average value, for a sinusoidal
waveform.
13. What is total harmonic distortion? Find the total harmonic distortion of a voltage waveform
with the following harmonic frequency make up :
Fundamental = V1 = 114 V
3rd harmonic = V3 = 4 V
5th harmonic = V5 = 2 V
7th harmonic = V7 = 1.5 V
9th harmonic = V9 = 1 V
14. What are the effects of harmonics on these devices? Explain in brief.
a. Transformer
b. AC motors
c. Capacitor banks
d. Telecommunication lines
15. What are the different techniques for controlling harmonics? What is difference between
active and passive filter?
SECTION-C
16. What is the need of power quality standards? What are different standards associated with
harmonics. Explain power acceptability curve with example.
17. What is power quality monitoring? What are the differences between analog and digital
current loop measurements? Describe briefly the various monitoring equipment's used m
power system.
18. Explain block diagram of active filter? Explain working of each block in brief.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 26 June 2021