Download GTU BE/B.Tech 2019 Summer 6th Sem New 2162409 Power Electronic Circuits ? Ii Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2162409 Power Electronic Circuits ? Ii Previous Question Paper

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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2162409 Date:16/05/2019
Subject Name:Power Electronic Circuits ? II
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) What is significance of THD ? Give its equation. 03
(b) Describe single phase bridge inverter with R load with gate and output
waveforms.
04
(c) Describe different methods for inverter output control. 07

Q.2 (a) Define harmonic factor. 03
(b)
Explain the principle of operation of resonant converters.
04
(c)
Write a short note on three phase inverter with 120? conduction mode
07
OR
(c) Draw single phase bridge inverter with RL load. Also draw its load
voltage and load current waveforms.
07
Q.3 (a) Define odd and even symmetry of waveform with example. 03
(b) Define quarter wave symmetry and discuss its significance in Forier
analysis of waveform.
04
(c) Derive THD of square wave output wave form of an inverter. 07
OR
Q.3 (a) Sketch unipolar and bipolar modulated inverter output voltage
waveform.
03
(b) Explain advantages of active front end rectifier. 04
(c) Explain integral cycle control and derive equation for its output voltage. 07
Q.4 (a) Explain cascaded H-bridge multilevel inverter in brief. 03
(b) Why dead band is required in inverter gating pulses ? 04
(c)
Write a short note on SVPWM.
07
OR
Q.4 (a) Give comparison of voltage source and current source inverters. 03
(b) Explain techniques for generating dead band for inverter switches. 04
(c)
Explain 3 level diode clamped multilevel inverter (DCMLI) with necessary
diagrams.
07
Q.5 (a) Why various PWM techniques are required in inverter ? 03
(b) Explain sine PWM technique with diagram. 04
(c)
Explain L-type ZCS resonant converter with circuit diagram and waveforms.
07
OR

Q.5 (a) Give classification of multilevel inverter. 03
(b) Give merits of multilevel inverter technology. 04
(c)
Explain the McMurray-Bedford half-bridge inverter with circuit diagram and
Waveforms.
07

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