Question Paper: Renewable Energy Sources Question Paper - May 2016 - Mechanical Engineering (Semester 8) - Mumbai University (MU)
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## Renewable Energy Sources - May 2016

### MU Mechanical Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

### Write notes on any Four of the following

1(a) Present status of power generation of India 5 marks

1(b) Horizontal axis wind turbine 5 marks

1(c) Energy audit 5 marks

1(d) Energy plantation 5 marks

1(e) Solar photo-voltaic system 5 marks

2(a) Calculate solar altitude angle, incident angle and collector efficiency if:
Location Pune: (18°32'N, 73°51'E)
Day and Time: May 15, 11 am
Annual intensity of solar radiation: 400 W/m2
Collector tilt=latitude angle
No. of glass covers=2
Heat removal factor=0.85
Transmittance of glass=0.88
Absorption of glass=0.90
Top loss coefficient=7 W/m2
Collector fluid temperature=73°C
Ambient temperature=28°C
Diffusive reflectance for two covers:0.24
5 marks

2(b) Show that maximum power coefficient is 59% for horizontal axis wind turbine. 5 marks

3(a) Discuss the factors which affect the production of bio-gas. 5 marks

3(b) Estimate the average daily global radiation on a horizontal surface in Baroda (22°N) if average sunshine hours are 9.5, a=0.35, b=0.4 and March, 16 is typical day for that month. 5 marks

4(a) What is wave energy? Explain any one wave energy conservation system. 5 marks

4(b) Describe pyranometer and sunshine recorder. 5 marks

4(c) Calculate the number of animals and volume of biodigester required to produce power for a household which has power requirement of 0.8 KW for lighting and cooking purpose.
take C.V. of methane 28 MJ/m3
Burner efficiency 70%,
Retention period 30 days,
Dry matter per animal per day is 1.8 kg,
Density of dry matter in slurry in dig-ester is 50kg/m3,
Bio-gas yield is 0.3m3 per kg of dry input.
Methane proportion in bio-gas is 0.6.
5 marks

5(a) Explain with a schematic the working of flash steam geothermal plant. What are its limitations. 5 marks

5(b) Derive an expression for tidal power for single basin area. 5 marks

5(c) Explain with schematic the working of KVIC plant in detail. 5 marks

### Write short notes on any Four

6(a) Need for alternate energy sources 5 marks

6(b) Comparison between liquid and air flat plate collectors 5 marks

6(c) Total energy conversion 5 marks

6(d) Local solar time 5 marks

6(e) Open cycle OTEC system 5 marks

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