Download GTU BE/B.Tech 2019 Summer 6th Sem New 2160913 Control Of Electrical Drives Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2160913 Control Of Electrical Drives Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2160913 Date:21/05/2019
Subject Name:Control of Electrical Drives
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.

MARKS

Q.1 (a) Enlist advantages of electrical drives. 03
(b) Write a note on load torque and its classification. 04
(c) Write a note on stability of an electrical drive. 07

Q.2 (a) Explain speed control methods of DC series motor. 03
(b) Explain dynamic model of DC motor drive. 04
(c) Explain speed and position control scheme of dc motor using dynamic model
of dc motor.
07
OR
(c) Explain the 3-? half wave converter drive for the speed control of separately
excited dc motor with waveforms at ?=30?, ?=150?.
07
Q.3 (a) Give dc 3points of comparison between converter fed dc drives and chopper
fed drives.
03
(b) Write a note on load equalization. 04
(c) Explain closed loop speed control of induction motor using slip control
scheme.
07
OR
Q.3 (a) Draw the of circuit 1-? dual converter drive for the speed control of
separately excited dc motor. Also draw the waveform.
03
(b) Explain stator voltage control of induction motor. 04
(c) Explain closed loop speed control of induction motor using current limit
control scheme.
07
Q.4 (a) Explain the effect of non sinusoidal supply on VSI. 03
(b) Give four points of comparison between scalar control and vector control of
induction motor
04
(c) Explain flux oriented vector control of induction motor. 07

OR
Q.4 (a) Enlist advantages of V/f control of induction motor. 03
(b) Draw block diagram of vector control of induction motor. 04
(c) Explain d-q model of induction motor. 07
Q.5 (a) What are the functions of power modulator? 03
(b) State advantages and disadvantages of electric traction drives. 04
(c) Explain general information about BLDC speed drives. 07
OR

Q.5 (a) Enlist factors to be considered for selection of electrical drive. 03
(b) Draw block diagram of solar powered drives and mention functions of each
block.
04
(c) Explain general information about synchronous motor variable speed drives. 07

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