Exam Details
| Subject | Power Electronics | |
| Paper | ||
| Exam / Course | B.Tech. VIEP- Electrical Engineering III | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
Draw and explain the characteristics of Power MOSFET.
What are the differences between BJTs and IGBTs?
2. What is reverse recovery charge of the power semiconductor diode? The reverse recovery time of a diode is trr 3 us and the rate of fall of the diode current is di/dt 30 A/us. Determine
the storage charge QRR, and
the peak reverse current IRR.
Draw and explain the I characteristics of a thyristor.
Explain di/dt ptoteclion of a thyristor.
Explain the principle of a single-phase thyristor converter with a resistive load.
Why is the power factor of semi converters better than that of full converters Differentiate between semi-converters and full converters.
5. In a single-phase full converter, the reduction in the output voltage due to the effect of source inductance is 3 volts. The load current Io is continuous and ripple-free equal to 100 Amp. Find the value of source inductance Ls and overlap angle JA., if the supply voltage is 230 50 Hz and a n/6.
Explain the working of cycloconverters. What are the advantages and disadvantages of cycloconverters
Explain the operation of a step-down chopper with necessary circuit diagram and waveforms.
7. Discuss the operation of a single-phase half bridge inverter with necessary circuit diagram and waveforms. The single-phase half bridge inverter using transistors has a resistive load of 2 Q. The DC supply is 24 V. Calculate:
RMS output VOltage at fundamental frequency
Output power
Average and peak load current
8. What are the various techniques of harmonic reduction in PWM (Pulse Width Modulation) inverters?
Explain the need of commutation in a thyristor circuit. Describe anyone type of commutation technique.
Discuss the operation of switching mode regulators with necessary diagrams and waveforms.
10. Write short notes on any two of the following:
Impulse Commutation
Series and Parallel Operation of Thyristors
Dual converters
Effect of Source Inductance in Converters
What are the differences between BJTs and IGBTs?
2. What is reverse recovery charge of the power semiconductor diode? The reverse recovery time of a diode is trr 3 us and the rate of fall of the diode current is di/dt 30 A/us. Determine
the storage charge QRR, and
the peak reverse current IRR.
Draw and explain the I characteristics of a thyristor.
Explain di/dt ptoteclion of a thyristor.
Explain the principle of a single-phase thyristor converter with a resistive load.
Why is the power factor of semi converters better than that of full converters Differentiate between semi-converters and full converters.
5. In a single-phase full converter, the reduction in the output voltage due to the effect of source inductance is 3 volts. The load current Io is continuous and ripple-free equal to 100 Amp. Find the value of source inductance Ls and overlap angle JA., if the supply voltage is 230 50 Hz and a n/6.
Explain the working of cycloconverters. What are the advantages and disadvantages of cycloconverters
Explain the operation of a step-down chopper with necessary circuit diagram and waveforms.
7. Discuss the operation of a single-phase half bridge inverter with necessary circuit diagram and waveforms. The single-phase half bridge inverter using transistors has a resistive load of 2 Q. The DC supply is 24 V. Calculate:
RMS output VOltage at fundamental frequency
Output power
Average and peak load current
8. What are the various techniques of harmonic reduction in PWM (Pulse Width Modulation) inverters?
Explain the need of commutation in a thyristor circuit. Describe anyone type of commutation technique.
Discuss the operation of switching mode regulators with necessary diagrams and waveforms.
10. Write short notes on any two of the following:
Impulse Commutation
Series and Parallel Operation of Thyristors
Dual converters
Effect of Source Inductance in Converters
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
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Subjects
- Power Electronics
- Power System Planning And Load Forecasting