GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018
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Subject Code: 2180911 Date: 15/11/2018Subject Name: Power Quality And Management
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks
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MARKS
Q.1 (a) List the sources of harmonics in power system. 03
(b) What is Electromagnetic Interference (EMI)? Describe main sources of EMI 04
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(c) Name and explain different types of power quality issues in brief. 07
Q.2 (a) List out the various instruments used for power quality measurement. 03
(b) Define flicker. List reasons responsible for flicker. 04
(c) Explain EMI mitigation methods in detail. 07
OR
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(c) Explain effect of harmonics on (1) transformers and (2) capacitor banks. 07
Q.3 (a) Discuss the sources of voltage sag. 03
(b) Write short note on voltage regulators. 04
(c) Explain the responsibilities of the suppliers and users of electrical power. 07
OR
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Q.3 (a) Differentiate grounding and bonding: 03
(b) Explain power quality issues with a system containing DG. 04
(c) List and explain different power quality issues affected by DG. 07
Q.4 (a) Explain active and reactive power factor in brief. 03
(b) Define displacement power factor and true power factor and list out the different methods for power factor improvement. 04
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(c) Explain application of synchronous condensers for power factor improvement. 07
OR
Q.4 (a) Write a note on harmonic analyzer. 03
(b) Discuss the Capacitor switching transient. 04
(c) Mention the types and causes of transients and explain any two in brief. 07
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Q.5 (a) State the essential elements of a grounding system. 03
(b) Write short note on importance and application of True RMS meter. 04
(c) Explain application of Ferro resonance transformer. 07
OR
Q.5 (a) Define the following terms. (1) Inrush current (2) Bonding (3) Form factor. 03
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(c) Explain the main steps to monitor the power quality problems at site. 07
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