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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
Subject Code:2181910 Date:25/01/2021
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Subject Name:Renewable Energy Engineering
Time:02:00 PM TO 04:00 PM Total Marks: 56
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Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain reserves, production and utilization of primary energy sources in India. 03
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(b) List the advantages and drawbacks of Renewable Energy 04
(c) Determine the Zenith angle, solar altitude angle and solar azimuth angle on 21st Jan at 11 am solar time at a location 48 N 07
Q.2 (a) Explain direct, sky and total radiation. 03
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(b) Explain the following terms with neat sketches: solar declination, Hour angle, solar altitude, zenith angle. 04
(c) List instruments used for measurement of solar radiation intensity. Explain Pyranometer with neat sketch. 07
Q.3 (a) List different types of concentrating collectors. Explain any one line focusing collector with neat sketch. 03
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(b) What are solar ponds? Discuss constructional working principle of solar pond with help of neat sketch 04
(c) Prove that in case of horizontal axis wind turbine maximum power can develop when exit velocity = 1/3 of wind velocity and Pmax = 8 pAV;® /27 07
Q.4 (a) Explain with neat diagram-variation of power coefficient with tip-speed ratio 03
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(b) Explain working of solar cooker. 04
(c) Derive the one dimensional momentum theory and Betz’s limit for the wind mill. Also state the assumption in theory and draw the variation of pressure and velocity in wind mill. 07
Q.5 (a) Explain downward draft gasifier with a neat diagram. 03
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(b) Explain the factors affecting production of biogas 04
(c) Write short note on effect of various parameters on performance of flat plate collectors. 07
Q.6 (a) Explain the basic principle of ocean thermal energy conversion? 03
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(b) Explain in brief with neat sketch: single basin, two-way tidal power plant. 04
Q.7 (a) Write short note on Magnus effect. 03
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(b) What are the advantages, dis-advantages and applications of geothermal energy? 04
(c) Explain with neat sketch the basic and working principle of MHD generator. Also compare with conventional power plant. 07
Q.8 (a) Define (1) time value of money (2) Net present value (3) Future value. 03
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(b) Explain return of investment (ROI)? Write down its limitation. 04
(c) With usual notations derive an expression for cumulative savings 07
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