GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Power Quality And Management
Time: 02:30 PM TO 05:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
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Subject Code: 2180911 Date: 21/11/2019Subject 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) | Discuss the sources of voltage sag | 03 |
| (b) | Name and explain different types of power Quality issues that affect the power system depending upon the severity? | 04 |
| (c) | Discuss the responsibilities of suppliers and users for power quality. | 07 |
| Q.2 | ||
| (a) | How atmospheric conditions are responsible for transients in power system. | 03 |
| (b) | What is an ITIC graph? Draw and discuss the ITIC graph in detail. | 04 |
| (c) | List cures for low frequency disturbances. Explain any two | 07 |
| OR | ||
| (c) | Explain different power frequency disturbances. | 07 |
| Q.3 | ||
| (a) | What are the different sources of transient overvoltage? | 03 |
| (b) | What do you mean by order of harmonics? When even order harmonics will be present in the system? Explain its effect on induction motor. | 04 |
| (c) | Define Transient. Discuss switching of loads & interruption of fault currents as cause of transients | 07 |
| OR | ||
| Q.3 | ||
| (a) | Differentiate Grounding & Bonding | 03 |
| (b) | Explain the signal reference ground methods | 04 |
| (c) | List and explain various harmonic mitigation techniques | 07 |
| Q.4 | ||
| (a) | State the importance of power factor in industry as per power quality study | 03 |
| (b) | Define (i) radiated emission (ii) Attenuation (iii) common mode noise (iv) transverse mode noise. | 04 |
| (c) | Define, displacement power factor and true power factor. List the methods of power factor improvement techniques and explain the static VAR compensator. | 07 |
| OR | ||
| Q.4 | ||
| (a) | What is Electromagnetic Interference? Describe main sources of EMI | 03 |
| (b) | Describe the effect of EMI on power quality. | 04 |
| (c) | What is EMI? Explain the EMI mitigation techniques | 07 |
| Q.5 | ||
| (a) | Write short note on importance and application of True RMS meter | 03 |
| (b) | List and explain advantages and disadvantages of distributed generation. | 04 |
| (c) | Explain number of test locations & test durations for power quality. | 07 |
| OR | ||
| Q.5 | ||
| (a) | Describe phenomena of islanding. | 03 |
| (b) | What are the various instruments used for power quality measurements. | 04 |
| (c) | List and explain various power quality issues affected by distributed generation | 07 |
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