Question Paper: Alternate Energy Sources : Question Paper May 2015 - Mechanical Engineering (Semester 6) | Gujarat Technological University (GTU)
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## Alternate Energy Sources - May 2015

### Mechanical Engineering (Semester 6)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) What are the conventional and non-conventional energy sources? Describe briefly(7 marks) 1 (b) Which instruments are used for solar radiation measurements. Explain construction and working of Pyranometer.(7 marks) 2 (a) Classify different types of solar collectors and explain the construction details of a flat plate collector with neat sketch.(7 marks)

### Answer any two question from Q2 (b) or Q2 (c)

2 (b) Define the following:
1. Solar constant
2. Air mass
(7 marks)
2 (c) Determine the number of day light hours in Shrinagar on 5th January and 5th July. Latitude: 36 degree 05 Minutes.(7 marks)

### Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Describe the main consideration in selecting the site for wind energy conversion system.(7 marks) 3 (b) A propeller type horizontal shaft wind turbine has diameter of 90 meter and operating speed is 50 RPM at its maximum efficiency. Wind at 1 bar and 25°C has a velocity of 12 m/s. Calculate:
1. Total power density in the wind stream
2. Maximum obtainable power density
3. Reasonable obtainable power density assuming η=38%
4. Total power produced
5. Torque and axial thrust produced at maximum efficiency
(7 marks)
3 (c) How solar water heating are classified? Explain working of Thermo Syphon water heating system with neat sketch.(7 marks) 3 (d) What is the Solar Still? Explain with neat sketch.(7 marks)

### Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) How are Bio gas plants are classified ? Explain continuous and batch type plants.(7 marks) 4 (b) Discuss the factors which affect the bio gas production in detail.(7 marks) 4 (c) Enlist the advantages of geothermal energy. Explain liquid dominated geothermal plant.(7 marks) 4 (d) State the different types of geothermal energy resources. Explain the hot dry rock geothermal resources and their utilization.(7 marks)

### Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Describe the construction and working of OTEC system based on closed cycle with the help of schematic diagram.(7 marks) 5 (b) Explain with sketches the various methods of tidal power generation. What are the limitation of each methods?(7 marks) 5 (c) State MHD principle. Explain open MHD with neat diagram.(7 marks) 5 (d) State the methods of waste heat utilization and explain any one.(7 marks)