N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-II
PAPER-XII
(Science and Technology of Renewable Energy)
Annual Examination, 2017
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Explain 'Green house effect' and the co-relation of the rise of atmospheric carbon dioxide
concentrion with the rise in average temperature.
2. State and explain drift velocity. Derive expression for conductivity and mobility.
3. Explain absorption depth, absorption coefficient and generation rate in semiconductor materials.
4. Explain diode equation for ideal and nonideal diodes and explain the importance of dark
current.
5. Explain I V curve of a solar cell and discuss the short circuit Current and differentiate it from
illuminated current.
6. What is meant by airmass and how is it related to the standardized solar spectrum What are
major atmospheric effects limiting the performance of photovoltaic applications
7. Discuss the efficiency of a solar cell and explain the importance of fill factor in a solar cell.
8. Explain minority carrier life time and diffusion length in a single semiconductor crystal.
9. Explain light trapping mechanism and lambertian reflectors. Point out the applications of these
reflectors in reducing optical losses.
10. Explain capacity factor of wind farms. How does it help in increasing the reliability of wind
farms.