Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 6th Sem 2160913 Control Of Electrical Drives Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VI (NEW) EXAMINATION ? WINTER 2020
Subject Code:2160913 Date:01/02/2021
Subject Name:Control of Electrical Drives
Time:02:00 PM TO 04:00 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) Give six factors to be considered for the selection of drive.
03
(b) Enlist functions of power modulator.
04
(c) Explain how moment of inertia can be determined for an electrical motor.
07
Q.2 (a) Give 3points of comparison between converter fed dc drives and chopper
03
fed dc drives.
(b) Explain components of load torque.
04
(c) Explain speed and position control scheme of dc motor using dynamic
07
model of dc motor.
Q.3 (a) Explain working of static scherbius drive.
03
(b) Explain V/f control of induction motor.
04
(c) Explain the working of 1- dual converter drive for the speed control of
07
separately excited dc motor .
Q.4 (a) Explain stator voltage control of induction motor.
03
(b) Enlist operating modes of doubly fed induction machine. Explain any one of
04
them in brief.
(c) Explain the 3- half wave converter drive for the speed control of separately
07
excited dc motor with waveforms at =60?
Q.5 (a) Draw speed torque characteristics with current source inverter. Show the
03
region of characteristic where flux is more than the rated flux.
(b) Explain vector control principle of AC motor drive.
04
(c) Explain closed loop speed control of induction motor using slip control
07
scheme.
Q.6 (a) Compare VSI fed Induction motor drive with CSI fed induction motor drive
03
on the basis of load commutation, nature of input and PWM technique usage.
(b) Give four points of comparison between field oriented control and direct
04
torque control.
(c) Explain closed loop speed control of induction motor using current limit
07
control scheme.
1
Q.7 (a) Enlist advantages of traction drives.
03
(b) Draw block diagram of solar drives and explain briefly function of each
04
block.
(c) Explain d-q model of induction motor.
07
Q.8 (a) Explain desired characteristics for drive used in traction.
03
(b) Write a note on servo motor drives.
04
(c) explain indirect vector control method for 3- induction motor.
07
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2
This post was last modified on 04 March 2021