Download Previous Year PTU University Question Paper of Power Electronics BTEE-504 5th Sem Batch 2011 Onwards B.Tech PTU Nov 2016 Question Paper
B.Tech. (EE-2011 Batch)
POWER ELECTRONICSÂ
Subject Code : BTEE-504Â Â Â Â Â Paper ID : [ 70557]
Time : 3 Hrs.             Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power Electronics BTEE-504 5th Sem Batch 2011 Onwards B.Tech PTU Nov 2016 Question Paper
SECTION-A
Q1. Write Briefly.
i. Define latching and holding current of a thyristor.
ii. What do you understand by PIV rating of a thyristor?
iii. What is a snubber and why is it used?
iv. What is phase control in a thyristor?
v. What is the purpose of a chopper?
vi. What is feedback diode and where is it used?
vii. What is di/dt and dv/dt ratings of a thyristor?
viii. Why and where the zener diode is used for thyristors?
ix. Can a converter be used as an Inverter? If yes how and if no why?
x. Differentiate between SUS and SCS.
                   SECTION-B
Q2. Attempt any FOUR questions.                                  5×4=20
2. Discuss the transient characteristics of a thyristor and explain various terms used in it.
3. Differentiate between line and load commutations of a thyristor.
4. Explain the operation of a voltage commutated chopper with the help of its waveforms.
5. Explain the operation of a single phase bridge inverter with the help of circuit diagram and associated waveforms.
6. Discuss the PWM control for reduction of harmonics in the inverter output voltage.
                   SECTION-C
Q3. Attempt any TWO questions.               2×10=20
7. Discuss the need of static and dynamic equalization for the series and parallel operation of thyristors. Also discuss various protection circuits used for thyristors.
8. Draw the circuit diagram of a three phase bridge converter and explain its operation with the help of various waveforms.
9. Write short note on any of two :
a. Single phase bridge cyclo-converter.
b. Modified Mc- Murray Half bridge Inverter.
c. Classification of choppers.
Latching and holding current of a thyristor.
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PIV rating of a thyristor.
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Snubber and why is it used.
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Phase control in a thyristor.
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Purpose of a chopper.
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Feedback diode and where is it used.
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di/dt and dv/dt ratings of a thyristor.
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Explain Why and where the zener diode is used for thyristors?
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Explain Can a converter be used as an Inverter.
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Comparison between SUS and SCS.
Power Electronics BTEE-504 5th Sem B.Tech PTU Nov 2016 PaperÂ
Transient characteristics of a thyristor.
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Comparison between line and load commutations of a thyristor.
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Operation of a voltage commutated chopper with the help of its waveforms.
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Operation of a single phase bridge inverter with the help of circuit diagram.
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PWM control for reduction of harmonics in the inverter output voltage.
Power Electronics BTEE-504 5th Sem B.Tech PTU Nov 2016 PaperÂ
Need of static and dynamic equalization for the series and parallel operation of thyristors.
Discuss various protection circuits used for thyristors.
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Circuit diagram of a three phase bridge converterÂ
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Single phase bridge cyclo-converter.
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Modified Mc- Murray Half bridge Inverter.
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Classification of choppers.
Power Electronics BTEE-504 5th Sem B.Tech PTU Nov 2016 Paper
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