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Wind Energy Quiz 4 (25 MCQs)

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1. About how many birds are killed annually in the U.S. because of wind turbines?
2. What does an anemometer do?
3. What are the three nonrenewable sources
4. How does the author organize paragraphs 2 through 4?
5. How many jobs were supported by the U.S. wind power industry in 2016
6. Currently less than 1% of the Earth's energy needs are (2) _____ by wind, with Denmark being the most wind-friendly producing 23% of its own energy needs from wind.
7. The mechanical power of a wind turbine can be used for:
8. Which of the following is a disadvantage to wind energy?
9. What wind speed is said to be necessary to make large wind energy systems economically viable?
10. About how many countries use wind energy?
11. A wind turbine has average power output P. If the blade length of the turbine is tripled, what is the new average power?
12. What is one downside of wind-turbine as an energy source?
13. _____ turn wind power into electricity
14. Maximum axial thrust occurs when interference angle is
15. What instrument measures wind direction
16. When multiple utility scale wind turbines are placed together they are referred to as:
17. Wind turbines generate electricity as the wind rotates its _____
18. How Does A Wind Turbine Make Electricity?
19. The amount of energy available in the wind at any instant is proportional to
20. What number of blades would probably be best on a windmill that was pumping water or grinding grain?
21. To generate lift, a blade is angled so the _____ pressure air moves under the blade.
22. The device/equipment used to harvest the aerodynamic force from the wind and convert it into electrical energy is called:
23. Yawing is when a wind turbine:
24. Determine the minimum blade length needed for a 85 % efficient wind turbine that needs to sustain an output power of 360 W with a wind speed of 2.5 m s$^{-1}$. (air density is 1.3 kg m$^{-3}$)
25. The law which determines windmill's possible efficiency is called
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