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Ece 573 Renewable Energy Technologies Question Paper

Ece 573 Renewable Energy Technologies

Course:Bachelor Of Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2008

ECE 573: RENEWABLE ENERGY TECHNOLOGIES

CONTINUOUS ASSESSMENT TEST

QUESTION ONE
a. Draw a clearly labelled diagram showing the environmental impact caused due to large hydropower construction and briefly explain each environmental impact. (10mks)

QUESTION TWO
a.
i. Draw a simple equivalent circuit for a solar cell indicating all the parameters. (2mks)

ii. Sketch the V and power curves for solar cell indicating all critical points. (2mks)

b. Give four major reasons for low efficiency of solar cells. (2mks)

c. A solar cell (0.9 sq cm) receives solar radiation with photon of 1.8 eV energy having an intensity of 0.9 mW/sq cm. Measurements show open circuit voltage of 0.6 V/sq cm, short circuit current of 10 mA/sq cm, and a maximum of 50% of the short circuit current. The efficiency of the cell is 25%. Calculate the maximum voltage that the cell can give and find the fill factor. (4mks)

QUESTION THREE
a. With the help of a neat sketch explain how the lift force is developed on the blades of a wind turbine. (4mks)

b.
i. Why is regulating systems required for wind energy system. (2mks)
ii. Explain clearly the difference between two main methods of controlling power for wind speeds above the rated wind speed indicating how each method is achieved. (4mks)

Ece 573 Renewable Energy Technologies Question Paper

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