Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII (OLD) EXAMINATION — SUMMER 2019Subject Code: 172403 Date: 16/05/2019
Subject Name: Power Processing Circuits - 11
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- 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
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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
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(b) Compare ZVS and ZCS. 07OR
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
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(b) Draw the block diagram of on-line UPS. Explain each block in brief. 07OR
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
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(b) Explain the single-phase bidirectional controller having RL load with neat waveforms. 07OR
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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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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