GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Subject Code: 3152001
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
Subject Name: Electro Mechanical Energy Conversion
Time: 10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 (a) | Define (1) Magnetic flux density (2) Self inductance (3) Mutual Inductance. | 03 |
| (b) | Define (1) Magnetic flux (2) Generated EMF (3) Induced EMF (4) Reluctance. | 04 |
| (c) | State basic principles of (1) DC motor (2) Induction motor (3) Synchronous motor (4) Stepper Motor (5) BLDC Motor (6) Servo motor (7) PMDC motor | 07 |
| Q.2 (a) | Define field energy and co-energy. What is significant of co-energy? | 03 |
| (b) | Explain the hysteresis and eddy current losses. | 04 |
| (c) | Draw and explain the torque — speed characteristic of a hysteresis motor. What are the common applications of hysteresis motor? | 07 |
| Q.3 (a) | A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed of stator magnetic field with respected to the rotor? | 04 |
| (b) | Explain DC series generator load characteristics. | 07 |
| Q.4 (a) | Draw and explain doubly excited magnetic field system. | 03 |
| (b) | Draw and explain the characteristics of a DC shunt motor. | 04 |
| (c) | State some important applications of stepper motors and PMDC motors. | 07 |
| Q.5 (a) | State and Explain different approximation made while analyzing electromagnetic devices. | 03 |
| (b) | A 3 phase 440 V, 50 Hz induction motor has 4% slip. Calculate frequency of rotor current. | 04 |
| (c) | State advantages of servo motors over large industrial motors. Explain double field Revolving theory. | 07 |
| Q.6 (a) | Explain construction of PMDC motors. | 03 |
| (b) | Explain construction of DC servo motors. | 04 |
| (c) | Explain construction details of single phase shaded pole motor with suitable diagram. | 07 |
| Q.7 (a) | Explain various types of magnetic materials and their properties. | 03 |
| (b) | Explain with usual expression Faraday’s law and Lenz’s law. | 04 |
| (c) | State and Explain Ampere’s law. | 07 |
| Q.8 (a) | Explain construction and characteristics of DC servo motor. | 03 |
| (b) | State applications of PMDC motor. | 04 |
| (c) | Explain construction and working of 3 Phase induction motor. | 07 |
Date: 29/01/2021
Total Marks: 56
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