1. Biomass, the largest of the renewable energy sources, accounted for how much
ID: 801944 • Letter: 1
Question
1. Biomass, the largest of the renewable energy sources, accounted for how much US Energy in 2014?
a. 44.25 quadrillion BTU
b. 25 quadrillion BTU
c. 10 quadrillion BTU
d. 9.6 quadrillion BTUe. 4.8 quadrillion BTU
2. Which of the following is true about wind power based on the CSS factsheet?
a. Capacity factors for wind are typically higher on land than offshore.
b. The best wind turbines have an efficiency of converting wind energy to electricity of 75%.
c. Commercial wind energy prices are roughly 2 times higher than the average electricity price paid by residential consumers.
d. The US has the largest installed wind capacity in the world compared to other countries.
e. Wind speed and energy production increase strongly with height about the ground in most locations.
3. Which of the following is true about solar photovoltaic (PV) energy based on the CSS factsheet?
a. The efficiency (amount of electrical energy out compared to solar energy in) for typical solar photovoltaic modules is 50%.
b. The US has approximately 50% of all solar photovoltaic capacity installed in the world.
c. The average annual solar radiation in Virginia is approximately 4.5 – 5.5 kWh/m2/day.
d. More than 10% of US land area would be required to meet US energy demand using solar PV arrays.
e. The cost of solar photovoltaic electricity has leveled out in recent years at approximately 10 times the average cost of residential electricity.
4. Which of the following is true based on the Hydropower video?
a. Impoundment hydropower uses
a separate river channel to generate electricity using a turbine.
b. Pumped storage hydropower acts like a battery by pumping water back to reservoirs at higher elevation for
release later to generate electricity.
c. Diversion hydropower uses dams and a reservoir to generate electricity using a turbine.
d. More than half of all dams in the US have equipment to use hydropower for electricity generation.
e. Dams without hydropower turbines must be demolished and rebuilt in order to add this capability.
5. Which of the following Geothermal systems uses hot fluid to heat a second heat transfer fluid which flashes at a lower temperature to turn the turbine?
a. Dry Steam Geothermal Power Plant
b. Flash Steam Geothermal Power Plant
c. Binary Cycle Geothermal Power Plant
d. Recycled Waste Water Geothermal Power Plant
e. Geyser Heat Transfer Geothermal Power Plant
6. In the Hawaii Solar Power Video, implementation of more residential solar power is primarily limited by which of the following:
a. Low electricity rates so payback times for solar power are long
b. Additional transportation costs from continental US and China
c. Electricity grid infrastructure technical issues since electricity must be managed both to and from the
customer
d. High additional grid taxes on solar customers which help pay for infrastructure but increase consumer cost
e. Lack of customer interest and demand
7. Based on the wind section (I.4) in MacKay’s book and using the average wind power production per land area factor, how much land is needed for a 3 MW (peak power rating or capacity) assuming a 33% capacity factor?
a. 0.5 km2
b. 1.5 km2
c. 2.0 km2
d. 3.0 km2
e. 6.0 km2
8. Based on the wind section (III B Wind II) in MacKay’s book, which of the following is true regarding wind power.
a. For the same wind speed, less dense air on a mountain ridge gives more power than denser air at sea level
due to reduced friction.
b. If the wind speed doubles, the power generated by a wind turbine is approximately 2x larger.
c. If the wind speed doubles, the power generated by a wind turbine is approximate 4x larger.
d. If the length of a 3-blade wind turbine doubles, the energy generated will be approximately 2x larger.
e. If the length of a 3-blade wind turbine doubles, the energy generated will be approximately 4x larger.
9. Based on the solar section (I.6) in MacKay’s book, which of the following most accurately represents the potential
of solar and wind to generate energy in Britain?
a. Solar PV (farm) > Wind > Solar PV (residential) > Solar thermal (residential)
b. Solar PV (farm) > Wind > Solar thermal (residential) > Solar PV (residential)
c. Wind > Solar PV (farm) > Solar PV (residential) > Solar thermal (residential)
d. Solar thermal (residential) > Solar PV (farm) > Wind > Solar PV (residential)
e. Solar PV (residential) > Solar PV (farm) > Solar thermal (residential) > Wind
10. Which of the following is true regarding the use of supercritical steam for geothermal power?
a. It can be obtained at shallower drilling depths
b. It is more efficient because the steam and water phases do not have to be separated
c. It has lower temperature and pressure than conventional geothermal steam systems
d. There are no corrosion issues associated with this type of steam
e. It produces 30% of Iceland’s electricity
Explanation / Answer
1. d
2 c
3 d
4 a
5 c. It is basically known as binary system of generating and sinking of heat to get a thermal gradient point.
6c
7 d
8 a
9 c
10 b. Super critical steam doesnot change phase and thus it help to conserve latent heat energy therefore the efficiency to convert heat energy into electricity will be high.
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