Download GTU BE/B.Tech 2019 Summer 7th Sem Old 172403 Power Processing Circuits Ii Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem Old 172403 Power Processing Circuits Ii Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (OLD) EXAMINATION ? SUMMER 2019
Subject Code: 172403 Date: 16/05/2019

Subject Name:Power Processing Circuits - II

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) Describe operation of Mc murray ?Bedford inverter. 07
(b) Discuss the different PWM technique. 07

Q.2 (a) Draw and explain basic series inverter. What are its limitations? 07
(b) Explain the space vector modulation technique for the control of an inverter
output.
07
OR
(b) Why multi-level inverter is required? Describe basic operation of same. 07

Q.3 (a) Explain 120? mode operation of three-phase inverter with circuit diagram and
waveforms.
07
(b) Compare ZVS and ZCS. 07
OR
Q.3 (a) Explain 180? mode operation of three-phase inverter with circuit diagram and
waveforms.
07
(b) Explain the Fourier analysis of a square wave inverter and thus derive the THD
in the output voltage waveform.
07

Q.4 (a) Explain the external control of ac output voltage of an inverter. 07
(b) Draw the block diagram of on-line UPS. Explain each block in brief. 07

OR
Q.4 (a) What are the transformer tap changers? 07
(b) Draw the block diagram of off-line UPS. Explain each block in brief. 07

Q.5 (a) Write short note on:- Active front-end rectifier. 07
(b) Explain the single-phase bidirectional controller having RL load with neat
waveforms.
07
OR

Q.5 (a) Discuss Triplen harmonic injection technique for inverter control. 07
(b) Explain cascaded H ? bridge multi-level inverter in brief. 07

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