Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2180911 Power Quality And Management Previous Question Paper
Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2180911 Date:19/01/2021
Subject Name:Power Quality And Management
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) What are the effects of EMI on health? Enlist them.
03
(b) Explain displacement power factor and true power factor with
04
necessary equation.
(c) Explain various power quality issues due to distributed generation.
07
Q.2 (a) What is THD? According to IEEE 519, state various voltage and
03
current THD?
(b) Explain the Power Quality Issues: Voltage Sag and Swell with
04
suitable example.
(c) Explain the types and causes of the transients in electrical circuits.
07
Q.3 (a) What is grounding and bonding? How do they effect on electrical and
03
electronics circuits?
(b) Write the various shock hazards for 100 A, 1-5 mA, 5-10 mA and
04
10-20 mA, 30 mA on Human body.
(c) Explain earth resistance test as per NEC code.
07
Q.4 (a) Draw the earth resistance Vs distance graph and write its importance.
03
(b) Explain the electric shock hazards with necessary diagram when the
04
electric motor is not grounded.
(c) Write a short note on : Signal Reference Ground.
07
Q.5 (a) What is harmonics? Explain with necessary waveforms.
03
(b) Write a short note on TDD.
04
(c) Enlist the various EMI mitigation methods. Explain anyone in detail.
07
Q.6 (a) When do we record harmonic signature? How does it help for health
03
of the electrical equipments?
(b) What are the major sources of current harmonics?
04
(c) Explain improvement in power factor using static VAR compensator.
07
Q.7 (a) How do you select the measurement tools and location for the power
03
quality issues?
(b) Find out apparent power, active power, reactive power and power factor
04
for:
(c) What is "k rating" and "derating factor" of a transformer? Find the
07
transformer derating factor for: A transformer with a full load current
rating of 1200 A is subjected to a load with nonlinear characteristics
1
of the following data. The transformer has a rated winding eddy
current loss density of 10% (0.1 pu).
Harmonic number (h) fh (pu)
1
1
3
0.38
5
0.19
7
0.11
9
0.06
Q.8 (a) What is the role of data loggers and chart recorders in case of
03
measurement of power quality?
(b) What are issues with interfacing of the distributed generations? Enlist
04
them.
(c) Explain the effects of harmonics on capacitor banks.
07
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This post was last modified on 04 March 2021