Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2170910 Power Quality And Management Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2170910 Date: 15/11/2018
Subject Name: Power Quality and Management
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define: (1) Bonding (2) Flicker (3) Distortion 03
(b) State the importance of ground rings. 04
(c) Analyze the transient response when DC voltage is suddenly applied to circuit
contains resistance and capacitance in series.
07
Q.2 (a) Identify the three regions in graph provided by Information Technology
Industry Council (ITIC) for guiding the voltage tolerance limit.
03
(b) Discuss the responsibilities of consumers and suppliers of electrical power? 04
(c) Explain the use of isolation transformer as a cure of low frequency
disturbances.
07
OR
(c) State the effect of harmonics on AC motor.
07
Q.3 (a) 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
03
(b) Illustrate the phenomenon to cause transients in power system due to
atmospheric condition.
04
(c) Explain how static VAR compensator improves the power factor of system. 07
OR
Q.3 (a) Explain the formation of electrolytic reactions due to ground grids. 03
(b) 5-MVA transformer is loaded to 4.5 MVA at a power factor of 0.82 lag.
Calculate the leading kVAR necessary to correct the power factor to 0.95 lag.
04
(c) Discuss the signal reference ground method to provide low impedance plane
for sensitive load.
07
Q.4 (a) Define the term: Electromagnetic interference susceptibility 03
(b) State the advantage of power factor correction. 04
(c) Illustrate the process of voltage levels build up on surface due to static
electricity.
07
OR
Q.4 (a) Define the terms related to electromagnetic interference:
(1) Filter (2) Shielding (3) Bandwidth
03
(b) Explain in detail about the triboelectricity. 04
(c) Explain how shielding is used to mitigate the EMI.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2170910 Date: 15/11/2018
Subject Name: Power Quality and Management
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define: (1) Bonding (2) Flicker (3) Distortion 03
(b) State the importance of ground rings. 04
(c) Analyze the transient response when DC voltage is suddenly applied to circuit
contains resistance and capacitance in series.
07
Q.2 (a) Identify the three regions in graph provided by Information Technology
Industry Council (ITIC) for guiding the voltage tolerance limit.
03
(b) Discuss the responsibilities of consumers and suppliers of electrical power? 04
(c) Explain the use of isolation transformer as a cure of low frequency
disturbances.
07
OR
(c) State the effect of harmonics on AC motor.
07
Q.3 (a) 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
03
(b) Illustrate the phenomenon to cause transients in power system due to
atmospheric condition.
04
(c) Explain how static VAR compensator improves the power factor of system. 07
OR
Q.3 (a) Explain the formation of electrolytic reactions due to ground grids. 03
(b) 5-MVA transformer is loaded to 4.5 MVA at a power factor of 0.82 lag.
Calculate the leading kVAR necessary to correct the power factor to 0.95 lag.
04
(c) Discuss the signal reference ground method to provide low impedance plane
for sensitive load.
07
Q.4 (a) Define the term: Electromagnetic interference susceptibility 03
(b) State the advantage of power factor correction. 04
(c) Illustrate the process of voltage levels build up on surface due to static
electricity.
07
OR
Q.4 (a) Define the terms related to electromagnetic interference:
(1) Filter (2) Shielding (3) Bandwidth
03
(b) Explain in detail about the triboelectricity. 04
(c) Explain how shielding is used to mitigate the EMI.
07
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2
Q.5 (a) A triboelectric material with a capacitance of 1 ?F is charged to a potential of
20,000 V. What is the value of the resistance required to discharge the
material to a safe voltage of 100 V in 1 sec?
03
(b) How oscilloscope is used to measure the repetitive high frequency
waveforms?
04
(c) Explain the use of true RMS meter. 07
OR
Q.5 (a) For what purpose, harmonic analyzers are used. 03
(b) Explain how filters are used to mitigate the EMI. 04
(c) Illustrate the static protective workstation setup showing the use of wrist
strap, a shoe strap and an antistatic floor mat.
07
*************
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This post was last modified on 20 February 2020