Download GTU B.Tech 2020 Winter 6th Sem 2161708 Power Electronics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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

1. (a) Define: 03
   1. Duty cycle
   2. Reverse recovery time for diode
   3. Hold time of filter-rectifier.

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2. (b) Write a short note on the following terms associated with SCR: 04
   1. Holding current
   2. Latching current
3. (c) Write a short note on IGBT in detail. 07

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1. (a) Give comparison between single-phase and three-phase rectifier. 03
2. (b) Short note : applications of IGBT and MOSFET 04
3. (c) With waveforms explain single-phase half-wave controlled rectifier with resistive load. 07

1. (a) What is inverter? Give the difference between oscillators and inverter. 03
2. (b) Short note: Quasi square wave inverter. 04

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3. (c) Explain two-level chopper and two-level inverter using single pole double throw switch. 07

1. (a) Write a short note on isolated converter. 03
2. (b) Short note: Switching characteristics of transistor. 04
3. (c) Write a short note on power MOSFET. 07

1. (a) Explain the benefits of isolation between input and output. 03

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2. (b) Short note: Opto-isolated MOSFET drive circuit. 04
3. (c) Write a short note on the operation of step-down converter with waveforms of the various signals of circuit. 07

1. (a) Short note: DIAC 03
2. (b) Explain in detail the importance of freewheeling DIODE 04
3. (c) Draw & explain the V-I characteristics of TRIAC. 07

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1. (a) Short note: Single phase two level inverter topology. 03
2. (b) Short note: Chopper 04
3. (c) Explain in detail the Snubber circuit. 07

1. (a) Explain the classification of commutation techniques. 03
2. (b) Short note: buck-boost converter. 04

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3. (c) Write a short note on six step inverter. 07

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