Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2162003 Control Of Electric Drives Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2162003 Date:16/11/2018
Subject Name:Control of Electric Drives
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) State the advantages and disadvantages of electric drives. 03
(b) Give classification of load torque with their characteristics. 04
(c) Explain the four quadrant operation of electrical drive with example. 07
Q.2 (a) Explain how to determine the moment of inertia of drive system. 03
(b) Draw and explain basic block diagram of electric drives. 04
(c) Derive the mathematical model of separately excited DC machine. 07
OR
(c) Draw and explain the Dynamic V-I characteristics of SCR in detail. 07
Q.3 (a) Define the terms: (1) latching current (2) holding current (3) circuit turn-off
time.
03
(b) Explain design of snubber circuit. 04
(c) Explain in brief various control strategies of a chopper. 07
OR
Q.3 (a) Give the classification of Choppers. 03
(b) Draw the circuit diagram of 1-phase half wave controlled rectifier. Also draw
the waveform of output voltage with R-load with ? = 60
0
04
(c) Explain A.C. phase control of TRIAC using DIAC. 07
Q.4 (a) Explain the field control method for DC motor. 03
(b) Enlist methods of braking in AC motors and explain any one in detail. 04
(c) Explain the speed control method of 3-phase induction motor. 07
OR
Q.4 (a) Explain the armature control method for DC motor. 03
(b) Explain with necessary diagram 3-point starter using in dc motor. 04
(c) Give the comparison between various methods of braking in dc motors. 07
Q.5 (a) Explain any one speed control method of 3-phase induction motor in detail. 03
(b) Explain chopper controlled DC motor drive operation for various modes. 04
(c) Explain various PWM techniques for single phase inverter and three phase
inverter.
07
OR
Q.5 (a) Enlist methods of braking in DC motors. 03
(b) Explain in detail: Ideal dual converters. 04
(c) Explain the construction and control of variable reluctance steeper motor in
detail.
07
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This post was last modified on 20 February 2020