GTU BE 2020 Summer Question Papers || Gujarat Technological University
Subject Name: UTILIZATION OF ELECTRICAL ENERGY AND TRACTION
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI EXAMINATION — SUMMER 2020
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Subject Code: 2160907 Date:28/10/2020Subject Name: UTILIZATION OF ELECTRICAL ENERGY AND TRACTION
Time: 10:30 AM TO 01:00 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) | Suggest suitable drives for following applications 03 1) Lathe 2) Papermill 3) Electric traction. |
| (b) | Define 1) Luminous efficiency 2) Chemical equivalent 04 3) Refrigerant |
| (c) | Draw speed time characteristic of main line traction system. 07 --- Content provided by FirstRanker.com --- Also explain each part in detail. |
| Q.2 | |
| (a) | Classify different track electrifications. 03 |
| (b) | Explain faraday’s law of electrolysis. 04 |
| (c) | Discuss the various factors that are to be considered in selection 07 of electric drive for particular application. |
| OR | |
| (c) | A 15KW, 220V, single phase resistance oven employs nickel- 07 chrome wire for its heating elements. If the wire temperature is not to be exceed 1000° ¢ and the temperature of the charge is to be 600%. Calculate the diameter and length of the wire. Assume --- Content provided by FirstRanker.com --- radiating efficiency to be 0.6 and emissivity as 0.9, for nickelchrome resistivity is 1.016 x-10% Qm. |
| Q.3 | |
| (a) | State level of illumination as per Indian standard for following 03 applications 1) Offices 2) Street lighting 3) Hospitals. |
| (b) | Explain function-of flywheel with calculations when load is 04 increasing. |
| (c) | Explain direct and Indirect resistance heating. 07 |
| OR | |
| Q.3 | |
| (a) | Define the following terms with respect to illumination. 03 --- Content provided by FirstRanker.com --- 1) Co-efficient of utilization.2) Depreciation factor 3) Space height ratio |
| (b) | Discuss properties of resistance heating elements. 04 |
| (c) | Construction and working of Arc furnace. 07 |
| Q.4 | |
| (a) | State advantages of electric welding. 03 |
| (b) | Explain dielectric heating. 04 |
| (c) | Explain construction and working of direct arc furnace and 07 indirect arc furnace. |
| OR | |
| Q.4 | |
| (a) | State requirements of good weld. 03 |
| (b) | Explain 1) Electro deposition 2) Electro platting 04 |
| (c) | Compare Arc welding and resistance welding 07 |
| Q.5 | |
| (a) | Compare AC and DC welding 04 |
| (b) | Draw a diagram of electric locomotive and explain function of 07 each part in it. |
| OR | |
| (a) | Explain with neat diagram the pantograph collector. 03 |
| (b) | Compare AC and DC traction system. 04 |
| (c) | Draw electrical circuit of a domestic refrigerator. Also explain 07 --- Content provided by FirstRanker.com --- working of each component in it. |
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