GTU BE 2019 Summer Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V(OLD) EXAMINATION - SUMMER 2019
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Subject Code:150901 Date:19/06/2019
Subject Name:Electrical Machine - 11
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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| Q.1 (a) | Explain the Parallel operation of 3-phase transformer. | 07 |
| Q.1 (b) | Discuss different methods of speed control of 3—phase Induction motor. | 07 |
| Q.2 (a) | Explain cogging effect and crawling effect in detail. | 07 |
| Q.2 (b) | Explain the polarity test in 3-phase Transformer. | 07 |
| Q.3 (a) | Why we require starters for 3- phase induction motors? Explain Auto-transformer starter with necessary circuit diagram. | 07 |
| Q.3 (b) | Describe the construction and working of a double-cage induction motor. | 07 |
| Q.3 (OR) | Explain principle, advantages and applications of Linear Induction Motor. | 07 |
| Q.4 (a) | Why a 1-phase induction motor is not self starting? Explain the starting methods for single phase induction motor in brief. | 07 |
| Q.4 (b) | Explain Scott connection for transformer with diagram. | 07 |
| Q.4 (OR) | Discuss the doubly fed induction motor with its advantages and disadvantages. | 07 |
| Q.5 (a) | Explain the Sumpner’s test in 3-phase transformer. | 07 |
| Q.5 (b) | A squirrel cage induction motor when started by means of a star-delta starter takes 180% of full load line current and develops 35% of full load torque at starting. Calculate the starting torque and current in terms of full load values, if an auto transformer with-75% tappings were employed. | 07 |
| Q.5 (OR) | Discuss the construction, working principle and applications of shaded pole induction motor. | 07 |
| Q.5 (a) | Explain working principle, construction of Repulsion motor. | 07 |
| Q.5 (b) | Explain construction of welding transformer. How does it differ from power transformer? | 07 |
| Q.5 (OR) | Explain working principle and construction of scharge motor. | 07 |
| Q.5 (a) | Explain the construction, working principle and applications of induction generator. | 07 |
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