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Envs 321:Renewable Energy December 2010 Question Paper

Envs 321:Renewable Energy December 2010

Course:Bachelor Of Environmental Science

Institution: Kabarak University question papers

Exam Year:2010

KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2010/2011 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF ENVIRONMENTAL
SCIENCE
COURSE CODE: ENVS 321

INSTRUCTIONS:
Answer ALL questions in section A and any two in section B

SECTION A
QUESTION ONE
a) Define the following terms citing examples;
i. Biomass (2 marks)
ii. Gasification (2 marks)
iii. Combustion (2 marks)
b) Briefly discuss five sources of biomass, cite two examples for each (5 marks)
c) Briefly explain how plant biomass is made and stored. (3 marks)
d) Discuss three techniques that can be used to convert biomass to fuel. (3 marks)
e) Discuss three environmental impacts of biomass fuel exploitation. (3 marks)
f) Discuss three factors that you consider desirable for a producer gas. (3 marks)
g) Explain how producer gas purification can be achieved. (4 marks)
h) Cite two examples of liquid fuels. (2 marks)
i) Explain in detail how ethanol can be made from corn. Indicate the various steps, yeasts
used and the roles played by the yeasts in the process. (5 marks)
j) Using the equation below, calculate the amount of ethanol that can be made from 2 tons
of a feedstock containing 83% starch in a production plant with a conversion efficiency
of 86.1%. (3 marks)
C6H1206(aq) ? 2C2H5OH(aq) + 2CO2(g)
k) The sun is a nuclear plant. Explain this statement using nuclear reactions. (3 marks)

SECTION B
2. The use of municipal wastes in energy production provides an alternative source of
energy. Discuss. (10 marks)

3. Solar energy provides a cheap source of energy in rural areas. Discuss this statement and
explain how it can be harnessed. (10 marks)

4. Discuss the various factors you would consider when setting up an Ethanol
manufacturing plant. (10 marks)

Envs 321:Renewable Energy December 2010 Question Paper

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