Download GTU BE/B.Tech 2019 Winter 5th Sem New 2150903 Power Electronics ? I Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2150903 Power Electronics ? I Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150903 Date: 29/11/2019

Subject Name: Power Electronics ? I
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) In brief discuss pulse transformer and opto-coupler. 03
(b) Discuss about the two-transistor analogy of thyristor. 04
(c) Explain series operation of SCR, also derive the expression for static
equalizing resistor.
07
Q.2 (a) Draw the detail structure and symbol of IGBT. 03
(b) Draw and explain the static V-I characteristic of SCR. 04
(c) Explain the programmable UJT as an oscillator for SCR triggering. 07
OR
(c) Draw and explain the triggering circuits for series connected SCRs. 07
Q.3 (a) List the applications of AC-DC Converters. 03
(b) Discuss about the effect of source and load inductance for ac to dc
converter.
04
(c) Write a note on single phase semi controlled asymmetrical
converter.
07
OR
Q.3 (a) Draw circuit diagram and waveform for single phase full wave
rectifier with bridge configuration.
03
(b) Derive the equation of output voltage for single phase full- wave
controlled rectifier with RL load.
04
(c) Explain full wave fully controlled converter in rectification and
inversion mode.
07
Q.4 (a) List the application of DC coppers. 03
(b) Explain the basic principle of DC Chopper. 04
(c) Explain voltage commutated DC Chopper with necessary waveform
and circuit diagram.
07
OR
Q.4 (a) Derive an expression of output voltage for boost chopper. 03
(b) Explain the voltage control methods for DC Chopper. 04
(c) Explain the principle of Buck-Boost converter in continuous mode
of operation.
07
Q.5 (a) List the speed control methods for DC motor. 03
(b) Draw the circuit diagram and waveform for single phase fully
controlled rectifier with RLE load.
04
(c) Explain three phase fully controlled converter based dc drive. 07
OR

Q.5 (a) What is regenerative braking. 03
(b) Briefly discuss about the dual converter. 04
(c) Explain four quadrant dc-dc converter for DC motor drive. 07

*******
FirstRanker.com - FirstRanker's Choice