Download GTU BE/B.Tech 2017 Winter 7th Sem Old 170801 Power Electronics And Industrial Drives Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 7th Sem Old 170801 Power Electronics And Industrial Drives Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII ? EXAMINATION ? WINTER 2017

Subject Code:170801 Date:18-11-2017
Subject Name: Power Electronics & Industrial 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.

Q.1 (a) Describe the operation of full wave uncontrolled rectifier with R-L load with
neat sketch and necessary waveforms.
07
(b) Draw and explain the structure of power MOSFET. Also explain the principal
of operation and I-V characteristics of power MOSFET.
07

Q.2 (a) Explain with neat sketch the 1-? full wave controlled rectifier with R-L load
using its waveforms and equations.
07
(b) With neat sketch, explain two-transistor analogy of SCR in detail. 07
OR
(b) Draw and explain 3- ? half wave controlled rectifier with required waveforms
and equations.
07

Q.3 (a) List the power factors improvement methods for phase controlled rectifiers and
explain any one in detail.
07
(b) Discuss 3-? AC to AC converter with star connected resistive load. 07
OR
Q.3 (a) Explain with neat sketch the operation of 1-? cycloconverter with necessary
waveforms.
07
(b) Explain the voltage protection by selenium diode and metal oxide varistors in
detail.
07

Q.4 (a) Discuss the operation of current source inverter with necessary waveforms. 07
(b) Explain the following PWM methods for control of 1- ? inverter.
? Single Pulse Width Modulation
? Sinusoidal Pulse Width Modulation
07
OR
Q.4 (a) Briefly discuss the operation of 3- ? inverter for 120
0
mode of conduction.
Draw necessary waveforms.
07
(b) Discuss the role of Snubber Circuit from protection aspect. 07

Q.5 (a) What is DC drive? Discuss the basic characteristics of DC Motors. 07
(b) Explain V/f control of Induction Motor Drives with its merits and demerits. 07
OR

Q.5 (a) Briefly discuss the performance characteristics of Induction Motor. 07
(b) Discuss about the choice of A.C. & D.C. drives in detail. 07

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