Exam Details
| Subject | Power Electronics | |
| Paper | ||
| Exam / Course | BTCVI / BTECVI / BTELVI | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 3 IBIEL-019I
B.Tech. -VlEP -ELECTRONICS AND
COMMUNICATION ENGINEERING (BTECVI)
Term-End Examination
00926
June, 2016
BIEL-019 POWER ELECTRONICS
Time hours Maximum Marks 70
Note: Attempt any seven questions. Draw neat waveforms and circuit diagrams. Use of scientific calculator is allowed. Missing data, if any, may be suitably assumed.
1. Discuss the principle of working of a three-phase bridge inverter with an appropriate circuit diagram. Draw and explain phase and line voltage waveforms on the assumption that each thyristor conducts for 180°. The sequence of firing of various SCRs should also be indicated in the diagram. 10
2. Sketch the switching characteristics of a GTO during its turn-on and turn-off processes. Show the variation of voltage across the GTO and current through it during these two dynamic processes. Indicate clearly the various intervals into which turn-on and turn-off times can be subdivided. Discuss briefly the nature of these curves. 10
3. A single-phase bridge inverter may be connected to a load consisting of RLC overdamped, RLC underdamped. For all these loads, draw the load voltage and load current waveforms under steady operating conditions. Discuss the nature of these waveforms. 10
4. What is meant by step-up chopper? Explain its operation. Sketch the input voltage, input current, output voltage and output current waveforms. State the various assumptions made. 10
5. Discuss the effect of source inductance on the performance of a single-phase full converter indicating clearly the conduction of various thyristors during one cycle. 10
6. What is Pulse Width Modulation List the various PWM techniques. How do these differ from each other? Explain. 10
7. Discuss the various mechanisms by which thyristors can be triggered into conduction. 10
8. For a type-A chopper feeding on RLE load, show that the maximum value of rms current rating for the freewheeling diode, in case load current is ripple free, is given by 0.3849 10
9. What is regenerative braking Describe the regenerative braking of a chopper fed separately excited DC motor. Illustrate your answer with a circuit diagram and relevant waveforms. 10
10. Write short notes on any two of the following:
Slip-power Recovery Scheme
Speed Control of Induction Motors
TRIAC
B.Tech. -VlEP -ELECTRONICS AND
COMMUNICATION ENGINEERING (BTECVI)
Term-End Examination
00926
June, 2016
BIEL-019 POWER ELECTRONICS
Time hours Maximum Marks 70
Note: Attempt any seven questions. Draw neat waveforms and circuit diagrams. Use of scientific calculator is allowed. Missing data, if any, may be suitably assumed.
1. Discuss the principle of working of a three-phase bridge inverter with an appropriate circuit diagram. Draw and explain phase and line voltage waveforms on the assumption that each thyristor conducts for 180°. The sequence of firing of various SCRs should also be indicated in the diagram. 10
2. Sketch the switching characteristics of a GTO during its turn-on and turn-off processes. Show the variation of voltage across the GTO and current through it during these two dynamic processes. Indicate clearly the various intervals into which turn-on and turn-off times can be subdivided. Discuss briefly the nature of these curves. 10
3. A single-phase bridge inverter may be connected to a load consisting of RLC overdamped, RLC underdamped. For all these loads, draw the load voltage and load current waveforms under steady operating conditions. Discuss the nature of these waveforms. 10
4. What is meant by step-up chopper? Explain its operation. Sketch the input voltage, input current, output voltage and output current waveforms. State the various assumptions made. 10
5. Discuss the effect of source inductance on the performance of a single-phase full converter indicating clearly the conduction of various thyristors during one cycle. 10
6. What is Pulse Width Modulation List the various PWM techniques. How do these differ from each other? Explain. 10
7. Discuss the various mechanisms by which thyristors can be triggered into conduction. 10
8. For a type-A chopper feeding on RLE load, show that the maximum value of rms current rating for the freewheeling diode, in case load current is ripple free, is given by 0.3849 10
9. What is regenerative braking Describe the regenerative braking of a chopper fed separately excited DC motor. Illustrate your answer with a circuit diagram and relevant waveforms. 10
10. Write short notes on any two of the following:
Slip-power Recovery Scheme
Speed Control of Induction Motors
TRIAC
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
- School of Computer and Information Sciences (SOCIS)
- School of Continuing Education (SOCE)
- School of Education (SOE)
- School of Engineering & Technology (SOET)
- School of Extension and Development Studies (SOEDS)
- School of Foreign Languages (SOFL)
- School of Gender Development Studies(SOGDS)
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Subjects
- Advance Microprocessor And Architecture
- Analog and Mixed Mode VLSI Design
- Analog Communication
- Analog Electronic Circuits
- Analog Integrated Circuits Design
- Antennas and Propagation
- B10-Informatics
- Basics Of Electronics Engineering
- Computer Architecture
- Computer Communication Networks
- Control Engineering
- Data Communication And Network
- Device Modelling For Circuit Simulation
- Digital Electronics
- Digital Signal Processing
- Digital System Design
- Electromagnetic Field Theory
- Electronic Measurement and Inst
- Electronic Switching Circuits
- Embedded System Design
- Information Theory And Coding
- Linear Integrated Circuits
- Microcontrollers
- Microprocessor And Its Applications
- Microwave And Radar Engineering
- Multirate Systems
- Optical Fiber Communication
- Power Electronics
- Satellite And Tv Engineering
- Signal And Systems
- Wireless Communication