Download GTU BE/B.Tech 2019 Summer 4th Sem Old 142402 Fundamentals Of Power Electronics Question Paper

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Subject Code: 142402

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-IV(OLD) - EXAMINATION - SUMMER 2019

Subject Name: Fundamentals Of Power Electronics

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) Define commutation. Discuss utility of latching current and holding current in Power Electronics. (04)
2. (b) Fill in Blanks. (03)
   1. 1) works as a relaxation oscillator.
   2. 2) Diode that can works on a.c. is called

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   3. 3) operate at very low voltage.

1. (a) List the characteristics of an ideal switch. (07)
2. (b) Explain V-I Characteristics of SCR and Derive equation of anode current using two transistor analogy of SCR. (07)

1. (a) Define DIAC. Draw & Explain schematic diagram, symbol and V-I characteristic of DIAC. (07)

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2. (b) OR Explain UJT characteristics. How UJT works as relaxation oscillator? (07)

1. (a) What are the benefits of IGBT over SCR. Draw the structure, symbol & output characteristics of IGBT? (07)
2. (b) Write a detail note on:- TURN ON methods of SCR. (07)

1. (a) OR Compare the following term: (07)
   1. 1. Power Diode and PIN Diode
   2. 2. Fast Recovery Diode and Schottky Diode

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2. (b) Explain in details Converter Grade and Inverter Grade Thyristors. (07)

1. (a) Draw and explain schematic construction, symbol and V-I characteristic of LASCR. (07)
2. (b) Define Rectification. Explain working of 1- @ Controlled Rectifier along with neat circuit diagram and waveform. (07)

1. (a) OR Explain dv/dt and di/dt protection of SCR. (07)

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2. (b) Define and classify AC voltage controllers. Explain in Detail single phase AC Regulators. (07)

1. (a) Draw and explain STEP-UP Chopper with necessary equation. (07)
2. (b) Draw and explain single phase MC-MURRAY Inverter circuit with suitable waveforms. (07)

1. (a) OR Discuss principle and working of SMPS with the help of block diagram. (07)
2. (b) What do you mean by Cycloconvertors? Explain 1-Phase Cycloconverters in detail. (07)

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Date: 25/05/2019

Total Marks: 70