POWER ELECTRONICS
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)
Time: 3 Hours
Total Marks: 100
Note: Attempt all question. Use of calculator is
permitted.
Answer any four parts
of the following:
- What are the different methods of firing employed for
SCR triggering? Explain UJT firing circuit with relevant waveforms.
- Discuss the two transistor model of thyristor and
derive an expression for the anode current.
- Draw the static V-I characteristics of SCR and explain
its mode of operation.
- Name the different power electronic converters
available and list their advantages over conventional modes of conversion
and control.
- What are the characteristics of n ideal power switching
device? Compare the characteristics of IGBT and MOSFET.
- Draw & Explain the circuit diagram for turning on & Turning off operation of a G.T.O.
