GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2170910
Subject Name: Power Quality and Management
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q1 | (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 | |
| Q2 | (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 | |||
| (a) | State the effect of harmonics on AC motor. | 03 | |
| (b) | Find the total harmonic distortion of a voltage waveform with the following harmonic frequency make up: Fundamental = V1 =114V 3rd harmonic=V3 =4V 5th harmonic=V5=2V 7th harmonic=V7=15V 9th harmonic=V9=1V | 04 | |
| Q3 | (a) | Illustrate the phenomenon to cause transients in power system due to atmospheric condition. | 07 |
| (b) | Explain how static VAR compensator improves the power factor of system. | 03 | |
| OR | |||
| (a) | Explain the formation of electrolytic reactions due to ground grids. | 04 | |
| (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. | 07 | |
| Q4 | (a) | Discuss the signal reference ground method to provide low impedance plane for sensitive load. | 03 |
| (b) | Define the term: Electromagnetic interference susceptibility | 04 | |
| (c) | State the advantage of power factor correction. | 07 | |
| OR | |||
| (a) | Illustrate the process of voltage levels build up on surface due to static electricity. | 03 | |
| (b) | Define the terms related to electromagnetic interference: (1) Filter (2) Shielding (3) Bandwidth | 04 | |
| (c) | Explain in detail about the triboelectricity. | 07 | |
| Q.5 | (a) | Explain how shielding is used to mitigate the EMI. | 03 |
| (b) | A material has a capacitance of 200 pF and 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? | 04 | |
| (c) | How oscilloscope is used to measure the repetitive high frequency waveforms? | 07 | |
| OR | |||
| (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 |
Date: 15/11/2018
Total Marks: 70
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