Download GTU BE/B.Tech 2019 Winter 6th Sem New 2160910 Electrical Drives Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2160910 Electrical Drives Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2160910 Date: 12/12/2019

Subject Name: Electrical 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.


Q.1 (a) Explain factors affecting the selection of drive. 03
(b) Draw the basic block diagram of electric drives and Explain
function of each block.
04
(c) What is electric drive? Advantages of electrical drive 07

Q.2 (a) What is load equalization? Why is it needed? 03
(b) Derive the condition for steady state stability of the drive. 04
(c) Explain the single phase full-wave converter with RLE load and
explain the operation for the firing angle beyond 90
o
.
07
OR
(c) Explain the four quadrant operation of chopper ( type-E) 07
Q.3 (a) Give comments on relation between carrier frequency and
harmonic frequency for PWM inverters.
03
(b) Explain closed loop Current limit control of DC machine. 04
(c) Explain d-q model of induction motor with required derivations. 07
OR
Q.3 (a) List advantages of PWM inverters 03
(b) What is the use of dynamic modeling of Induction motor? 04
(c) Explain the model referencing adaptive control (MARC) method. 07
Q.4 (a) What is self tuning control? Explain 03
(b) Explain advantages of poly phase rectifier 04
(c) Explain regenerative braking control in chopper based DC drive 07
OR
Q.4 (a) Explain Flux control method for speed control of DC shunt motor. 03
(b) What is sliding mode control? State its advantages 04
(c) Draw and explain torque-speed characteristics of DC shunt, PMDC
and DC series motors
07
Q.5 (a) Explain principle of vector control. 03
(b) State the advantages of electric traction drive 04
(c) Explain BLDC machine drive 07
OR
Q.5 (a) List the applications of servo motor drives 03
(b) Explain basic structure of solar and battery powered drives. 04
(c) Explain requirements of traction drive. 07

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