Download GTU B.Tech 2020 Winter 8th Sem 2181910 Renewable Energy Engineering Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2181910 Renewable Energy Engineering Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2181910 Date:25/01/2021
Subject Name:Renewable Energy Engineering
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.
Q.1 (a) Explain reserves, production and utilization of primary energy sources in
03
India.

(b) List the advantages and drawbacks of Renewable Energy
04

(c) Determine the Zenith angle, solar altitude angle and solar azimuth angle
07
on 21st Jan at 11 am solar time at a location 48 N


Q.2 (a) Explain direct, sky and total radiation.
03

(b) Explain the following terms with neat sketches: solar declination, Hour
04
angle, solar altitude, zenith angle.

(c) List instruments used for measurement of solar radiation intensity.
07
Explain Pyranometer with neat sketch.
Q.3 (a) List different types of concentrating collectors. Explain any one line
03
focusing collector with neat sketch.

(b) What are solar ponds? Discuss constructional working principle of solar
04
pond with help of neat sketch

(c) Prove that in case of horizontal axis wind turbine maximum power can
07
develop when exit velocity = 1/3 of wind velocity and P
3
max = 8 AVi / 27




Q.4 (a) Explain with neat diagram variation of power coefficient with tip-speed
03
ratio

(b) Explain working of solar cooker.
04

(c) Derive the one dimensional momentum theory and Betz's limit for the
07
wind mill. Also state the assumption in theory and draw the variation of
pressure and velocity in wind mill.
Q.5 (a) Explain downward draft gasifier with a neat diagram.
03

(b) Explain the factors affecting production of biogas
04

(c) Write short note on effect of various parameters on performance of flat
07
plate collectors.



Q.6 (a) Explain the basic principle of ocean thermal energy conversion?
03

(b) Explain in brief with neat sketch: single basin, two-way tidal power plant.
04
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(c) Explain Construction & working of Floating drum type biogas plant with
07
neat sketch
Q.7 (a) Write short note on Magnus effect.
03

(b) What are the advantages, dis-advantages and applications of geothermal
04
energy?

(c) Explain with neat sketch the basic and working principle of MHD
07
generator. Also compare with conventional power plant.



Q.8 (a) Define (1) time value of money (2) Net present value (3) Future value.
03
(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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