# EE6503 Power Electronics Nov Dec 2016 Important Questions

Important Questions for Anna University Chennai- Important University Questions / Question Bank / Previous University Questions - EE6503 Power Electronics
B.E/B.TECH DEGREE EXAMINATION NOV / DEC 2016
Fifth / 05th Semester / V Semester
Department of Electrical and Electronics Engineering
EE6503 Power Electronics
Nov Dec 2016 Important Questions
(Regulation 2013)

16 Marks Most Important Questions of EE6503 Power Electronic asked in previous years university examinations are provided below.

1. Examine the structure and different modes of operation with the characteristics of TRIAC
2. Describe V-I characteristics and switching characteristics of MOSFET
3. Describe with circuit IGBT static I-V, transfer and turn –on and turn –off characteristics
4. Commutation circuits of SCR – Class A, Class B, Class E,
5. (i) Label the operating principle of single phase dual converter (10)
(ii) A single phase full converter is connected with R- load. The source voltage is 230 V 50 Hz .The average load current is 10A for R=20 â„¦ .find the firing angle. (6)
6. Explain the working of single phase full controlled converter with various loads
7. A 230 V, 50 Hz supply is connected to load resistance of 12 â„¦ through half wave controlled rectifier. If the firing angle is 60 m degree, Calculate
(i) Average output voltage (4)
(ii) RMS output voltage (4)
(iii) Ratio of rectification and (4)
(iv) Transformer utilization factor (4)
8. Explain the working of three phase full controlled converter with various loads
9. Explain the working principle of step down and step-up choppers
10. i)Explain the various control strategies of chopper. (8)
ii) Analyze a filter component of a buck converter which has an input voltage of 12 V and output voltage of 5V. The peak to peak output ripple voltage is 20mV and peak to peak ripple current of inductor is limited to 0.8A. The switching frequency is 25KHz. (8)
11. Describe the working principle of buck-boost converter with necessary circuit and waveforms (16)
12. What is SMPS? Mention the types of SMPS. Explain flyback SMPS in detail. (16)
13. Explain the working of three phase inverter in both 120 and 180 mode with neat waveforms.
14. Describe the principle of operation of 3 phase voltage source inverter with 180˚conduction mode with necessary waveforms and circuits. Also obtain the expression for line to line voltage. (16)
15. Explain and Formulate the following PWM techniques used in inverter.
i) Sinusoidal PWM(8)
ii) Multiple PWM(8)
16. Demonstrate the working of a single phase full bridge inverter supplying R, RL loads with relevant circuit and waveforms.
17. Examine the two types of cyclo-converters.
18. Explain the working of step down Cycloconverter.
19. Prepare what is meant by positive conve rte r group in a cyclo converter.
20. Evaluate the applications of cyclo-converter