Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 8th Sem 2180911 Power Quality And Management Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ?SEMESTER-VIII EXAMINATION- SUMMER-2020
Subject Code: 2180911
Date:02/11/2020
Subject Name: Power Quality and Management
Time: 02.30 pm to 05.00 pm
Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define the power quality as per IEEE standards and list out
03
all the power quality issues.
(b) Define
the
following
terms
with
suitable
04
figures/waveforms.
1. Crest Factor 3. Distortion
2. Grounding 4. Bonding.
(c) Explain various sources of Voltage Sags and Voltage
07
Swell.
Q.2 (a) Explain in brief about Isolation Transformer,
03
(b) Give examples of Transient models and Transient
04
responses and explain any one in brief.
(c) List types and causes of transients and explain capacitor
07
bank switching.
OR
(c) Discuss the various DG technologies in brief.
07
Q.3 (a) Explain cable shielding to minimize Electromagnetic
03
Interference.
(b) Find out value of capacitor in KVAR to improve the power
04
factor of a 130KW Induction Motor from 0.8 to 0.9.
(c) List the methods for power factor improvement and
07
explain application of Synchronous Condensers.
OR
Q.3 (a) Describe an effect of EMI on power quality.
03
(b) Give the name of various Electromagnetic Interference
04
terminologies and describe CMRR and TMN.
(c) Explain various methods to mitigate EMI in detail.
07
Q.4 (a) Differentiate Grounding and Bonding.
03
(b) Write the function of essential elements of a grounded
04
electrical power system.
(c) Explain how an earth resistance tester is used to test the
07
resistance between the ground grid and earth.
OR
Q.4 (a) List out the various instruments used for power quality
03
measurements.
(b) Explain importance and application of True RMS meter.
04
1
(c) Explain number of test locations and test duration for
07
power quality measurement.
Q.5 (a) Load current of a non-linear load has following
03
components. RMS value of fundamental, 3rd,5th,and 7th
harmonics are 60A,30A,20A and 10A respectively. Find
Individual Harmonic Distortion as per IEEE standard.
(b) Find the total harmonics distortion of a voltage waveform
04
with the following harmonic frequencies by finding each
Individual Harmonic Distortions.
1. Fundamental V1=115V
2. 3rd harmonic V3 = 5V
3. 5th harmonic V5 = 3V
4. 7th harmonic V7 = 2V
5. 9th harmonic V9 = 1V
(c) Explain causes of Voltage and Current Harmonics.
07
OR
Q.5 (a) Define and explain the term" Distribution Generation".
03
(b) Draw the ITIC graph and explain its several regions.
04
(c) List and explain various power quality issues affected by
07
DG.
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This post was last modified on 04 March 2021