Subject Code: 2161006
GUJARAT TECHNOLOGICAL UNIVERSITY
--- Content provided by FirstRanker.com ---
SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Power Electronics Devices and Circuits
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
Q.1 (a) Explain the Silicon Controlled Rectifier with its static characteristics. [03]
(b) Explain Turn OFF methods of SCR. [04]
(c) Explain the construction, working and characteristics of IGBT. [07]
--- Content provided by FirstRanker.com ---
Q.2 (a) Explain snubber circuit for Thyristor protection. [03]
(b) Explain UJT as relaxation oscillator. [04]
(c) Explain switching characteristics of SCR. [07]
OR
(c) Explain two transistor analogy of SCR. [07]
--- Content provided by FirstRanker.com ---
Q.3 (a) Give comparison of Diac and Triac. [03]
(b) Explain control strategies of chopper. [04]
(c) Describe with suitable waveforms the operation of single phase fully controlled bridge converter with RL load. [07]
OR
(a) State the application of a cycloconverter. [03]
--- Content provided by FirstRanker.com ---
(b) Explain series inverter with circuit diagram and waveforms. [04]
(c) Explain the operation of Jones chopper in detail. [07]
Q.4 (a) Explain basic working of cycloconverter with its significance. [03]
(b) Explain Step down Chopper. [04]
(c) Write a short note on PWM inverter. [07]
--- Content provided by FirstRanker.com ---
OR
(a) Define working of inverter, chopper and rectifier. [03]
(b) Draw and explain Morgan Chopper. [04]
(c) What is cycloconverter? Explain single phase to three phase cycloconverter in detail. [07]
Q.5 (a) Explain basic working of battery charger. [03]
--- Content provided by FirstRanker.com ---
(b) What is SMPS? Write down the advantages of it. [04]
(c) Explain Dielectric heating and Induction heating in detail. [07]
OR
(a) Explain speed control by motor resistance for AC drives. [03]
(b) Explain static circuit breakers in detail. [04]
--- Content provided by FirstRanker.com ---
(c) Write a short note on online UPS system. [07]
Date: 16/05/2019
Total Marks: 70
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University