GTU Mechanical Engineering (Semester 6)
Alternate Energy Sources
May 2015
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) What are the conventional and non-conventional energy sources? Describe briefly
7 M
1 (b) Which instruments are used for solar radiation measurements. Explain construction and working of Pyranometer.
7 M

2 (a) Classify different types of solar collectors and explain the construction details of a flat plate collector with neat sketch.
7 M
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 M
2 (c) Determine the number of day light hours in Shrinagar on 5th January and 5th July. Latitude: 36 degree 05 Minutes.
7 M

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 M
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 M
3 (c) How solar water heating are classified? Explain working of Thermo Syphon water heating system with neat sketch.
7 M
3 (d) What is the Solar Still? Explain with neat sketch.
7 M

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 M
4 (b) Discuss the factors which affect the bio gas production in detail.
7 M
4 (c) Enlist the advantages of geothermal energy. Explain liquid dominated geothermal plant.
7 M
4 (d) State the different types of geothermal energy resources. Explain the hot dry rock geothermal resources and their utilization.
7 M

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 M
5 (b) Explain with sketches the various methods of tidal power generation. What are the limitation of each methods?
7 M
5 (c) State MHD principle. Explain open MHD with neat diagram.
7 M
5 (d) State the methods of waste heat utilization and explain any one.
7 M

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