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DEE-53106 Introduction to Renewable Energy Sources
Examination on 4.3.2016

1. Which of the following statements are true and which are not? Answer just true or false.

a) Peat has the second largest known resources of primary energy globally in the world
after coal.

b) It takes 3-6 months for a wind turbine to produce the energy that goes into production,
operation and recycling of the turbine.

c) Oil has the highest energy density (in TJ/kg) of all the energy sources used in
operationa! power plants.

d) Global share of the primary energy used to generate electrical energy is close to 20 %.

e) Discoveries of new oi] fields are larger than the consumption.

2. a) Name the top four primary energy resources (and technologies) by electric power
production capacity installed globally in 2013 (and thereafter). What are their shares?
b) How much the average world surface air temperature has been estimated to increase
during the next 100 years, if the consumption of fossil fuel continues to grow as it has
done during the past decades? How long will it take for the air to cool down back to
the present average temperature after all the CO2 emissions to the atmosphere have
ended?

3. a) What power production technologies have the two highest growth rates of annually
installed new capacity compared to their globally installed cumulative capacity?

b) What is a typical conversion efficiency of bioenergy to electrical energy?

c) What sources of renewable primary energy does not originate from the Sun (solar
radiation) at all?

4. a) What energy conversion processes/principles are used to convert the energy of
different primary energy sources to electrical energy?

b) Which sources of primary energy can be converted to electrical energy directly by
using just one conversion? What are the used principles/technologies?