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Alternative Energy Sources (Elective I) (October 2009)

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Total No. of Questions : 12] P1409 [Total No. of Pages : 3 [3664]-128 B.E. (Mechanical) ALTERNATIVE ENERGY SOURCES (Elective - I) (402045) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates:1) All questions are compulsory. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What do you mean by solar constant & air mass ratio? With a diagram mention & define the related angles used in solar geometry. [12] b) Calculate the day length on June 08 2009 for south facing surface tilted at an angle of 30 & located in pune (18 30'N). [4] OR Q2) a) b) Q3) a) b) Discuss the availability of solar energy in India & limitations of solar energy. [8] Distinguish between global & diffuse radiation. Describe the arrangement for measurement of diffuse radiation. [8] Explain the working of conventional liquid flat plate collector with the help of neat sketch. Give the energy balance for the absorber plate & define the instantaneous collection efficiency. Explain briefly the various loss coefficients. [12] Differentiate between active & passive solar heating system. [4] OR P.T.O. Q4) a) b) c) Q5) a) b) Discuss the brief applications of solar air heating. [6] What is significance of selective surfaces used in flat plate collector. Enlist some selective surfaces. [4] Discuss different factors which affect on performance of flat plate collectors. [6] What are the limitations of solar flat plate collectors? Enlist various solar concentrators. Explain cylindrical parabolic concentrator with [12] neat sketch. Discuss materials used in reflectors & concentrator. [6] OR Q6) Write short notes on : [18] a) Solar pond as energy storage. b) Heliostats. c) Solar still desalination system. SECTION - II Q7) a) b) Describe horizontal shaft wind turbine generator. Explain the terms pitch control & yaw control. [8] Derive an expression for efficiency of propeller type wind turbine & show that its limiting value is 0.593. [8] OR Q8) a) b) Which are the materials used for solar photovoltaic cells? Discuss their performances. Explain a solar photovoltaic system used in lighting.[8] Which are the types of solar power plants? Mention range of power produced for the same describe medium temperature solar power generation system with neat sketch. [8] Q9) a) Give suitable locations for geothermal power plant in India. What are the limitations of geothermal power plant. [8] b) Explain the working of single pool, double effect Tidal power plant.[8] [3664]-128 2 OR Q10)a) Explain with a schematic diagram the principle of closed cycle OTEC. What are the advantages? [8] b) Which are different types of fuel cells? Explain working with neat sketch. Also discuss performance of the same. [8] Q11)a) Describe floating dome type of biogas plant. Give example. Also state capacity of the plant. State advantages & limitations of floating type over fixed dome type of biogas plant. [12] b) Discuss the merits & demerits of biogas digester designs. [6] OR Q12)Write short notes on following : [18] a) Biogas for diesel engine. b) Environment protection norms ISO 14000. c) Biomass gasification. vvvv [3664]-128 3

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