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
3. Extra-terrestrial radiation
4. Terrestrial radiation
5. Beam radiation
6. Diffused radiation
7. Global radiation(7 marks) 2 (c) Determine the number of day light hours in Shrinagar on 5^th January and 5^th 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)