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Renewable Energy Sources Question Paper - Dec 18 - Mechanical Engineering (Semester 8) - Mumbai University (MU)
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Renewable Energy Sources - Dec 18

Mechanical Engineering (Semester 8)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1. Solve any five (a) State physics of solar photovoltaics.

(b) Strategy for meeting the future energy requirements in India.

(c) Site selection for windmill.

(d) Importance of energy audit.

(e) Environmental effects in the utilisation of Geothermal energy.

(f) Fuel properties of biogas.

(20 marks) 00

2(a) Derive an expression for maximum output fraction from wind power.
(8 marks) 00

2(b) Describe working of solar pumping system with neat sketch.
(6 marks) 00

2(c) Describe limitation of scope of tidal power plant.
(6 marks) 00

3(a) Calculate the local solar time and declination at a location latitude $23^\circ15'N$, longitude $77^\circ30'E$ at 12:30 IST on June 19, 2010. Equation of time correction is given from standard table for chart is 1'01''.

(8 marks) 00

3(b) Explain with sketches applications of biogas.
(6 marks) 00

3(c) Write a note on prospects of geothermal energy in India.
(6 marks) 00

4(a) Write a note on horizontal axis type wind turbine with the help of neat sketch.
(8 marks) 00

4(b) Discuss the working of single basin type tidal power plant.
(6 marks) 00

4(c) Discuss the working of flat plate collectors using air as a working fluid with the help of a neat sketch.
(6 marks) 00

5(a) Calculate the following parameters of a biogas system:

(i) The volume of biogas digester

(ii) The power available from biodigester

Given: Calorific value of methane: $28MJ/m^3$, Burner Efficiency: 70%, Number of cows: 8, Retention period: 20 days, Temperature of Fermentation: $30^\circ$, Dry matter (cow dung) collected per cow per day: 2Kg, Density of dry matter in fluid (slurry) in the digester: $50kg/m^3$, Biogas Yield: $0.2m^3$ per kg of dry input, Methane proportion in the biogas: 0.7

(8 marks) 00

5(b) Explain the concept of the total energy system in India.
(6 marks) 00

5(c) Explain basic sun-earth angles in details.
(6 marks) 00

6(a) Wind at 1 bar in 20$^\circ C$ has a velocity of 12m/s

Calculate (i) Total power density in wind stream.

(ii) Maximum power density

(iii) Reasonable obtainable power density

(iv) Total power produced if rotor diameter is 60 m and it runs at 50rpm.

(v) The torque and axial thrust produced at maximum efficiency.

(10 marks) 00

6(b) Discuss the analysis of aerodynamic forces acting on windmill blades.
(6 marks) 00

6(c) Discuss the prospects of Renewable energy sources in India.
(4 marks) 00

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