Download GTU B.Tech 2020 Winter 5th Sem 3152407 Power Electronics Circuits I Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152407 Power Electronics Circuits I Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152407 Date:27/01/2021
Subject Name:Power Electronics Circuits - I
Time:10:30 AM TO 12:30 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.

Q.1 (a) Give the classification of Uncontrolled rectifier.
03

(b) Explain the programmable UJT as an oscillator for SCR triggering.
04

(c) Explain the working of 1-? full wave Uncontrolled Rectifier with R load. Draw
07
necessary waveforms.


Q.2 (a) What is a chopper? List the application of chopper.
03

(b) Discuss importance and requirement of DC power supply.
04

(c) Draw necessary waveforms and explain working of single phase full controlled
07
rectifier circuit with RL load.
Q.3 (a) Discuss Dual Converter in brief.
03

(b) Discuss Star-Delta transformer connection used in multi-pulse Rectifier.
04

(c) Explain the working of 3-? Uncontrolled Rectifier with RL load. Draw
07
necessary figure and waveforms.




Q.4 (a) Discuss the significance of freewheeling diode in brief.
03

(b) Discuss about the effect of source and load inductance for ac to dc converter.
04

(c) Explain the working of 3-? controlled Rectifier with R load. Draw necessary
07
figure and waveforms.
Q.5 (a) Explain the basic principle of DC Chopper.
03

(b) Discuss second quadrant chopper with necessary diagrams.
04

(c) Explain the TRC & CLC control strategies for the control of chopper.
07



Q.6 (a) Discuss Type E chopper with circuit diagram.
03

(b) Differentiate voltage and current commutated choppers.
04

(c) Explain working principle of Jones Chopper with necessary waveforms.
07

Q.7 (a) Discuss SEPIC converter in breief.
03

(b) Discuss the principle of operation of Resonant converters.
04

(c) Explain the Buck-Boost converter with necessary waveforms.
07



Q.8 (a) Classify isolated dc-dc converters. State the advantages of Isolated DC-DC
03
Converters.
(b) Discuss Push Pull type isolated DC-DC converter.
04
(c) Discuss ZVS in details with necessary waveforms.
07

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