Download GTU BE/B.Tech 2018 Winter 5th Sem New 2152407 Power Electronic Circuits I Question Paper

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Subject Code: 2152407

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018

Subject Name: Power Electronic Circuits-I

Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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

Q.1

1. (a) Explain Latch-up in IGBT. [03]
2. (b) Design & discuss Gate driver circuit for MOSFET. [04]

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3. (c) List out all thyristor protections & discuss in details. [07]

Q.2

1. (a) Give comparison of MOSFET & IGBT. [03]
2. (b) Draw only symbol & internal structure & VI Characteristics of Power BIT. [04]
3. (c) Explain working of 3-phase 6 Pulse rectifier with RLE Load. Draw waveforms for Vi, Ve, Vo & Lo [07]

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OR

1. (a) Explain working principle of 12 pulse rectifier. [07]

Q.3

1. (a) Explain working of Class-A Chopper. [03]
2. (b) Draw only circuit diagram & waveforms for 1-Phase Full-wave Controlled Rectifier with RL Load in inversion mode. [04]

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3. (c) Enlist & explain triggering circuits for SCR. [07]

OR

1. (a) Discuss operation of class-C type two quadrant choppers with motor load. [03]
2. (b) Discuss principle of phase control rectifier. [04]
3. (c) Discuss working of 1-phase dual converter with suitable diagrams. [07]

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Q.4

1. (a) Draw circuit diagram & waveforms for SEPIC Converter. [03]
2. (b) Draw only circuit diagram & waveforms for Jones chopper. [04]
3. (c) Discuss operation of “Push-Pull type isolated DC-DC converter with necessary diagrams. [07]

OR

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1. (a) Give advantages of Zeta converter over conventional DC-DC converter. [03]
2. (b) Discuss operation of multi phase chopper with motor load. [04]
3. (c) Write a short note: Flyback converter. [07]

Q.5

1. (a) List out application of boost converter. [03]

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2. (b) Compare series & parallel resonant converter. [04]
3. (c) Explain operation of L-type ZCS converter with necessary equations & Diagrams. [07]

OR

1. (a) Compare Buck & Boost converter. [03]
2. (b) Enlist various requirements of isolation in power electronics circuits. [04]

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3. (c) Discuss ZVS resonant converter [07]

Date: 11/12/2018

Total Marks: 70

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