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Alternate Energy Sources (Elective I) (October 2010)

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Total No. of Questions :12] P1516 [Total No. of Pages :3 [3864]-137 B.E. (Mechanical) ALTERNATE ENERGY SOURCES (Elective - I) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer three questions from each section. Answers to the two sections must be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) Presently more use of non conventional sources of energy is preferred and advised. Why? Discuss its merits and demerits in detail. [10] What is solar constant? Intensity of solar energy received on earth surface is much less than the intensity with which it is beamed from surface of sun. Discuss various possible factors responsible for same. [8] OR Define following terms with neat sketch. i) Zenith angle ii) Solar azimuth angle iii) Surface azimuth angle iv)The hour angle v) Declination. [10] b) Determine the local solar time and declination at a location 23o 15 N, longitude 77o 30 E at 12.30 IST on June 19. Equation of time correction is given from standard chart is (-1 01 ) Indian standard time [8] is based on 82. 50oE. Q3) a) What is insulation? Discuss working of following instructions with neat sketches. i) Pyrometer ii) Pyrheliometer iii) Sunshine meter. [10] P.T.O. b) What is air mass? Discuss in brief the spectral distribution of extra terrestrial solar radiation graphically? What are limitations of solar energy? [6] OR Q4) Calculate the angle made by beam radiation with the normal to a flat collector on December 1at 9.00 A. M Solar time for location at 28o 35 N. The collector is tilted at angle of latitude plus 10o with the horizontal and is pointing due south. [16] Q5) a) b) What is solar still? Explain anyone type with neat sketch. Mention its uses. [8] Solar drying is superior to traditional drying, explain in brief. Draw neat sketch of forced circulation dryer, explain its working. [8] OR Q6) a) What is solar pond? How density gradient is maintained in it. Explain its working and method of energy extraction from it. [8] b) Advantages and limitations of concentrating solar collector over flat plate type collector. Define aperture, concentration ratio and acceptance [8] angle for concentrating collectors. SECTION - II Q7) a) Explain mechanism of direct conversion of solar energy into electric current in case of photovoltaic cells. Explain its advantages, disadvantages and various applications. [10] b) Discuss various types of wind machines with performance characteristics and limitations. Which type of wind you will recommend for commercial use. [8] OR Q8) a) What is fuel cell? Which may this is different from storage battery? Explain working of any one type of fuel cell. Mention its merits and demerits with future scope. [10] b) Explain the limitations of tidal power. Why it is not very popular method for non conventional sources of energy. [8] [3864]-137 -2- Q9) a) Explain the basic principle of OTEC. Describe open cycle OTEC system. [8] b) How power is produced from liquid dominated geothermal power plant. [8] OR Q10) a) Describe the important factors in selection of site for wind power generation. What is cut in speed and furling speed in case of wind considered while operating wind mill? [8] b) How cooling of space is done in summer by passive method using solar energy. [8] Q11) a) Draw schematic diagram of downdraft grassfire. Describe various zones with temperature and chemical reaction taking place in each zone.[10] b) What modifications are necessary if biogas is used in IC engine as a [6] fuel? OR Q12) a) Explain with neat sketch the working of biogas plant. Discuss important factors affecting the working of plant. How reaction is imitated in new biogas plant. [10] b) Explain the difference in construction of Dome type and fixed dome type of biogas plant. Advantages and disadvantages of each. [6] nnn [3864]-137 -3-

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Additional Info : 2003 Course
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