Download GTU BE/B.Tech 2019 Summer 4th Sem Old 142402 Fundamentals Of Power Electronics Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem Old 142402 Fundamentals Of Power Electronics Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:142402 Date:25/05/2019
Subject Name: Fundamentals Of Power Electronics
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) Define commutation. Discuss utility of latching current and holding current in
Power Electronics.
04
(b) Fill in Blanks.
(1) _____ works as a relaxation oscillator.
(2) Diode that can works on a.c. is called ______
(3) ______ operate at very low voltage.
03
(c) List the characteristics of an ideal switch. 07

Q.2 (a) Explain V-I Characteristics of SCR and Derive equation of anode current using
two transistor analogy of SCR.
07
(b) Define DIAC. Draw & Explain schematic diagram, symbol and V-I
characteristic of DIAC.
07
OR
(b) Explain UJT characteristics. How UJT works as relaxation oscillator? 07

Q.3 (a) What are the benefits of IGBT over SCR. Draw the structure, symbol & output
characteristics of IGBT?
07
(b) Write a detail note on:- TURN ON methods of SCR. 07
OR
Q.3 (a) Compare the following term:
1. Power Diode and PIN Diode
2. Fast Recovery Diode and Schottky Diode
07
(b) Explain in details Converter Grade and Inverter Grade Thyristors. 07

Q.4 (a) Draw and explain schematic construction, symbol and V-I characteristic of
LASCR.
07
(b) Define Rectification. Explain working of 1- ? Controlled Rectifier along with neat
circuit diagram and waveform.
07
OR
Q.4 (a) Explain dv/dt and di/dt protection of SCR. 07
(b) Define and classify AC voltage controllers. Explain in Detail single phase AC
Regulators.
07

Q.5 (a) Draw and explain STEP-UP Chopper with necessary equation. 07
(b) Draw and explain single phase MC-MURRAY Inverter circuit with suitable
waveforms.
07
OR

Q.5 (a) Discuss principle and working of SMPS with the help of block diagram. 07
(b) What do you mean by Cycloconvertors? Explain 1-Phase Cycloconverters in
detail.
07

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