Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem Old 133402 Electrical Drives And Controls Previous Question Paper
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:133402 Date:28/11/2018
Subject Name:Electrical Drives And Controls
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the classes of motor duty in details. 07
(b) Whatis an electrical drive? Draw and explain the block diagram of electrical
drives. Also write down its advantages?
07
Q.2 (a) Write a short note on various characteristic of DC shunt motor 07
(b) A 4-pole,240 V,wave connected shunt motor gives 1119 kW when running
at 1000 rpm and drawing armature and field currents of 50 A and 1.0 A
respectively. It has 540 conductors and its resistance is 0.1 ohms. Assuming a
drop of 1 Volt per brush, find (1)total torque(2)useful torque(3)useful
flux/pole(4)rotational losses and(5) Efficiency
07
OR
(b) A 250 V shunt motor with armature resistance of 0.5 ? runs at 600 r.p.m on full
load and takes an armature current of 20A. If resistance of 1.0 ? is placedin the
armature circuit, find the speed at (i) full load torque (ii) half full loadtorque.
07
Q.3 (a) State and explain the different classes of Squirrel cage motor. 07
(b) Explain Split phase & Shaded pole Induction motor with a neat sketch. 07
OR
Q.3 (a) Describe in detail the braking of DC shunt motor with neat sketch. 07
(b) Explain Autotransformer starter with neat diagram 07
Q.4 (a) What is the need of starter in DC motor? Explain 3-point starter with diagram 07
(b) Describe the Ward-Leonard speed control method? 07
OR
Q.4 (a) Explain the speed control methods of three phase induction motor by
(1) Stator voltage control
(2) Frequency control
07
(b) Explain the different slip power recovery schemes? 07
Q.5 (a) Explain types of Choppers with neat sketch. 07
(b) Explain Single phase Full bridge inverter with Resistive load 07
OR
Q.5 (a) Explain V/F control for AC drives. 07
(b) Explain Single phase Half wave controlled rectifiers with Resistive load. 07
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This post was last modified on 20 February 2020