Download GTU BE/B.Tech 2018 Winter 3rd Sem New 2133402 Electrical Drives And Controls Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2133402 Electrical Drives And Controls Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (New) EXAMINATION ? WINTER 2018
Subject Code:2133402 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) Describe the classification of Electric Drives 03
(b) Differentiate between AC and DC Drive. 04
(c) Explain the basic elements of an electric drive system with figure and also
mention the advantages of an Electric Drive.
07

Q.2 (a) Define DC Shunt and DC Series Motor with a neat sketch. 03
(b) A four pole, 3-phase, 50Hz, star connected induction motor has full load with
slip of 4%, Calculate the speed of the motor on full load condition.
04
(c) Explain Electric braking of DC shunt Motor 07
OR
(c) Derive the Torque equation of DC Motor and explain the characteristics of DC
Series Motor.

07
Q.3 (a) Define the term Slip and Synchronous speed. 03
(b) Differentiate between Squirrel cage and Slip ring induction Motors. 04
(c) Classify the different types of Single Phase Induction Motor and explain any
one of them with a neat sketch.
07
OR
Q.3 (a) Explain the necessity of starters for D.C Motor. 03
(b) Explain the effect of slip on Rotor frequency & Rotor induced EMF. 04
(c) Explain Induction motor as a transformer.


07
Q.4 (a) Why DC series motor should not be started without loaded conditions? 03
(b) Write a short note on Ward-Leonard method of speed control. 04
(c) Explain the types of Choppers with neat sketch. 07

OR
Q.4 (a) Explain any one of the speed control methodfor DC shunt Motor. 03
(b) Write down the applications of DC Choppers. 04
(c) Explain 3 point starter with a neat diagram.

07
Q.5 (a) Briefly explain the working of Star-Delta starter. 03
(b) Explain Voltage/frequency control of AC Drives. 04
(c) Explain Single phase Full Bridge Inverter with Inductive load 07
OR

Q.5 (a) Write down the merits and demerits of AC Drives. 03
(b) Differentiate between Voltage Source Inverter (VSI) and Current Source
Inverter (CSI).
04
(c) Explain Single phase Half wave controlled rectifier with Resistive load. 07


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