Power Electronics BTEE-504 5th Sem B.Tech EE Nov 2016 PTU Paper

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 ELECTRONICS 

Subject Code : BTEE-504          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.

 

Snubber and why is it used.

 

Phase control in a thyristor.

 

Purpose of a chopper.

 

Feedback diode and where is it used.

 

di/dt and dv/dt ratings of a thyristor.

 

Explain Why and where the zener diode is used for thyristors?

 

Explain Can a converter be used as an Inverter.

 

Comparison between SUS and SCS.

Power Electronics BTEE-504 5th Sem B.Tech PTU Nov 2016 Paper 

Comparison between line and load commutations of a thyristor.

 

Operation of a voltage commutated chopper with the help of its waveforms.

 

Operation of a single phase bridge inverter with the help of circuit diagram.

 

PWM control for reduction of harmonics in the inverter output voltage.

Power Electronics BTEE-504 5th Sem B.Tech PTU Nov  2016 Paper 

Power Electronics BTEE-504 5th Sem Batch 2011 B.Tech PTU nov 2016 Paper

Need of static and dynamic equalization for the series and parallel operation of thyristors.

Discuss various protection circuits used for thyristors.

 

Modified Mc- Murray Half bridge Inverter.

 

Classification of choppers.

Power Electronics BTEE-504 5th Sem B.Tech PTU Nov 2016 Paper 
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