Download GTU BE/B.Tech 2019 Summer 7th Sem New 2172410 Power Electronics Design Question Paper

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Subject Code:2172410

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019

Subject Name:Power Electronics Design

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.

Q.1

1. Explain design of Inductor for Power Converter. [03]
2. Write a technical note on Thermal protection. [04]

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3. Write a technical note on di/dt and dv/dt protection. [07]

Q.2

1. Explain the use of Snubber Circuit in detail. [03]
2. Write a brief note on PCB designing. [04]
3. Discuss the design aspects and component selection for Snubber Circuit. [07]

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OR

1. Describe the methods adopted for suppressing over voltages in thyrister. [07]
2. Explain driver circuit for IGBT. [03]
3. Explain any one Isolated driver circuit for Power Electronics device with design consideration. [04]

Q.3

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1. Explain Floating ground considerations for Isolated driver circuits. [07]

OR

1. Why Isolation is required in driver circuit of Power device? [03]
2. Explain the driver circuit for Full Wave Controlled Rectifier. [04]
3. Write a short note on design Considerations for Voltage Isolation and Current Capacity for PCB design. [07]

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Q.4

1. Write a short note on IGBT ratings. [03]
2. Explain importance of Pulse Transformer. [04]
3. Discuss the steps for design of low frequency Transformer with appropriate example. [07]

OR

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1. Describe the function of PUT with suitable example circuit. [03]
2. Explain importance of Opto-Isolator. [04]
3. Write a detailed note on Thermal Resistance & its Consideration. [07]

Q.5

1. Explain the Natural Cooling & forced Cooling of Heat Sinks. [03]

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2. Explain the difference between Single Layer & Multi Layered PCB. [04]
3. Discuss thermal modeling of power switching devices with mathematical equivalent circuit and neat diagram. [07]

OR

1. Explain the Transformer Design for Bridge. [03]
2. Explain the Noise Reduction Through PCB Layout. [04]

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3. Discuss the design of Push-Pull converter circuit. [07]

Date:18/05/2019

Total Marks: 70