GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
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Subject Code:2172408 Date:25/01/2021
Subject Name:Advanced Power Electronics Devices & Interface Circuits
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Why do semiconductors have a band gap? 03
(b) State working principle of Frequency & Speed Measurement. 04
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(c) Draw and explain Analog to Digital converter circuit. 07
Q.2 (a) Write a short note on use of Power Scope for power electronics applications. 03
(b) Write short note on Grounding for Power Circuits. 04
(c) Write the Merits and Demerits of Wide Bang Gap Power Semiconductor Devices. 07
Q.3 (a) State different methods of protecting power switch against over load. 03
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Explain any one with neat diagram.(b) Enlist isolated and non-isolated driver ICs. 04
(c) Explain Hall effect current sensors in detail. 07
Q.4 (a) Write full form of MOSFET. Discuss need of MOSFET driver? 03
(b) State various principles used in transducers used for current measurement in industry. 04
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(c) Explain with neat diagram, Single Switch Driver IC (e.g. HCPL316J) with SC Protection. 07
Q.5 (a) What is meaning of VOH and VOL voltage levels of logic ICs. 03
(b) Explain any DC Current measurement technique. 04
(c) Explain the Interfacing of Digital Signals with Different Voltage Levels. 07
Q.6 (a) Write full form of TTL and CMOS. Explain how a TTL IC can be interfaced with CMOS IC. 03
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(b) Explain the Signal Conditioning. 04
(c) Explain application of Linear Opto-coupler. 07
Q.7 (a) Write a full form of CRO and DSO. Compare CRO with DSO. 03
(b) Draw block diagram of CRO. 04
(c) Explain the F to V Converter in detail. 07
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Q.8 (a) State various wide band gap materials and their energy band gap. 03
(b) Draw Analog to Digital converter circuit. 04
(c) Explain the Differential Voltage Probe & Current Probe. 07
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