Exam Details
| Subject | Advanced Power Electronics | |
| Paper | ||
| Exam / Course | B.Tech. VIEP- Electrical Engineering III (BTCSVI/BTECVI/BTELVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 3 IBIEEE-01SI
B.Tech. -VIEP -ELECTRICAL ENGINEERING
(BTELVI)
Term-End Examination
U-l3b...5
December, 2016
BIEEE-018 ADVANCED POWER ELECTRONICS
Time hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Missing data, if any, may be suitably assumed. Use of scientific calculator is permitted.
1. The tum-off process in a GTO can be described with its two-transistor model. Explain this in detail. 5
Explain the basic construction and operation of IGBT. 5
2. Explain the constructional details and working of power MOSFET with its I characteristics. 10
3. For a 3-phase full converter, explain how the output voltage wave, for a firing angle of is obtained by using phase voltages, and 5 line voltages. 5
4. A single-phase semi-converter bridge feeds -RLE load. Discuss how the freewheeling diode comes into operation and holds the output voltage to almost zero for a given firing angle delay. Sketch the time variation of supply voltage, load voltage and current, freewheeling diode current and current through each pair consisting of SCR and diode. Also find the circuit turn-off time. Assume the load current is continuous. 10
5. A 3-phase semiconverter is connected to RLE load. For a firing angle delay of 120° draw the output voltage and load current waveforms in case the load current is continuous, and discontinuous. Discuss briefly the nature of waveforms obtained. 10
6. Explain the effect of blanking time on output voltage in a PWM inverter. 10
7. A single-phase CSI is fitted with ideal SCRs. Describe its working for capacitive load. Show that the frequency of input voltage to CSI is twice the frequency of triggering the thyristors. 10
8. Show that the performances of a single-phase full converter as affected by source inductance is given by the relation
cos(o cos o-(wLsI0)/Vm
where the symbols used have their usual meanings. 10
9. Explain the operation of Thyristor Switched Capacitors (TSCs) with the help of neat waveforms. 10
10. Explain the various methods of Reactive Power Compensation. 10
B.Tech. -VIEP -ELECTRICAL ENGINEERING
(BTELVI)
Term-End Examination
U-l3b...5
December, 2016
BIEEE-018 ADVANCED POWER ELECTRONICS
Time hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Missing data, if any, may be suitably assumed. Use of scientific calculator is permitted.
1. The tum-off process in a GTO can be described with its two-transistor model. Explain this in detail. 5
Explain the basic construction and operation of IGBT. 5
2. Explain the constructional details and working of power MOSFET with its I characteristics. 10
3. For a 3-phase full converter, explain how the output voltage wave, for a firing angle of is obtained by using phase voltages, and 5 line voltages. 5
4. A single-phase semi-converter bridge feeds -RLE load. Discuss how the freewheeling diode comes into operation and holds the output voltage to almost zero for a given firing angle delay. Sketch the time variation of supply voltage, load voltage and current, freewheeling diode current and current through each pair consisting of SCR and diode. Also find the circuit turn-off time. Assume the load current is continuous. 10
5. A 3-phase semiconverter is connected to RLE load. For a firing angle delay of 120° draw the output voltage and load current waveforms in case the load current is continuous, and discontinuous. Discuss briefly the nature of waveforms obtained. 10
6. Explain the effect of blanking time on output voltage in a PWM inverter. 10
7. A single-phase CSI is fitted with ideal SCRs. Describe its working for capacitive load. Show that the frequency of input voltage to CSI is twice the frequency of triggering the thyristors. 10
8. Show that the performances of a single-phase full converter as affected by source inductance is given by the relation
cos(o cos o-(wLsI0)/Vm
where the symbols used have their usual meanings. 10
9. Explain the operation of Thyristor Switched Capacitors (TSCs) with the help of neat waveforms. 10
10. Explain the various methods of Reactive Power Compensation. 10
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Subjects
- Active Filter Design
- Advanced Control System
- Advanced Power Electronics
- Applied Electromagnetics
- Basics Of Electrical Engineering
- Computer Process Control
- Control System
- Digital Electronics
- Electric Energy Utilization
- Electrical And Electronics Engineering Materials
- Electrical Instrumentation
- Electrical Machine - I
- Electrical Machines - Ii
- Electrical Machines And Electronics
- Electrical Measurements And Measuring Instruments
- Electro Mechanical Energy Conversion - I
- Electro-Mechanical Energy Conversion - Ii
- Electro-Mechanical Energy Conversion-Iii
- Electromagnetic Theory
- Energy Auditing And Analysis
- High Voltage Engineering
- Industrial Drives
- Micro Controllers
- Microprocessor And Applications
- Network Theory
- Power Quality Issues And Remedial Measures
- Power System
- Power System - I
- Stochastic Control Systems
- Switchgear And Protection