Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152001 Electro Mechanical Energy Conversion Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152001 Date:29/01/2021
Subject Name:Electro Mechanical Energy Conversion
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) Define (1) Magnetic flux density (2) Self inductance (3) Mutual
03
Inductance.
(b) Define (1) Magnetic flux (2) Generated EMF (3) Induced EMF
04
(4) Reluctance.
(c) State basic principles of
07
(1) DC motor (2) Induction motor
(3) Synchronous motor (4) Stepper Motor
(5) BLDC Motor (6) Servo motor (7) PMDC motor
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.
07
What are the common applications of hysteresis motor?
Q.3 (a) A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed
03
of stator magnetic field with respected to the rotor?
(b) Explain DC series generator load characteristics.
04
(c) Draw and explain doubly excited magnetic field system.
07
Q.4 (a) Draw and explain the characteristics of a DC shunt motor.
03
(b) State some important applications of stepper motors and PMDC motors.
04
(c) State and Explain different approximation made while analyzing
07
electromagnetic devices.
Q.5 (a) A 3 phase 440 V, 50 Hz induction motor has 4% slip. Calculate
03
frequency of rotor current.
(b) State advantages of servo motors over large industrial motors.
04
(c) 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
07
suitable diagram.
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
1
Q.8 (a) Explain DC servomotor torque-speed characteristics.
03
(b) State applications of PMDC motor.
04
(c) Explain construction and working of of 3 Phase induction motor.
07
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This post was last modified on 04 March 2021