Energy & the Environment - Sustainability - Ch. 12 May I ask for solution to the
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Question
Energy & the Environment - Sustainability - Ch. 12
May I ask for solution to the multiple choice questions 5 through 10 in the image?
Persia. How were the gyp n 10 mph in coastal areas, what is the maximum theoretically possible amount of electric power that can be produced for every square meter of windmills that appeared in Europe in th turbines? city Ages different from those earlier ,. They were used to generate electric They were used to grind grain. blade area? b. tO A Savonius wind turbine is constructed of four turned on a vertical axis sheets of plates 4-m in width and 12-m tall. They turned on a horizontal axis Wind with velocity of 12 m/s is blowing paralle d. The to the ground. Assuming kinetic to mechanical conversion efficiency of 25%, and generator They were similar, except used more blade s. Which states have the potential to genc the most amount of electricity from wind? a. Alaska, Montana, and California b. California, Texas, and lowa . North Dakota, Kansas, and Texas d. Illinois, California, and Alaska e. Alaska, Montana, and Hawaii Which of the following is (are) true for horizontal. axis wind turbines? a. They are the most commonly used throughout efficiency of 90%, what is the electrical power that can be generated? III. Multiple Choice Questions i. Which country invented the first practical wind turbines? a U.S. b. Netherlands 7. d. Persia e China wind energy for producing electricity, today? b. Germany d. China They have blades designed to maximize lift. e. Traditional Dutch wind mills are of this t d. They normally have higher efficiencies. e. All are true 2. Which country utilizes the most percentage of b s. Which of the following applies to a Savonius turbine? a. It is a vertical axis type. e Iran 3. Which country has the highest total installed wind It is a drag type. It has blades shaped like an S d. It is also known as the "egg-beater c. a, b, and c, but not d. capacity? U.S. b. 9. According to the U.S. Fish and Wildlife Service, d. China e. ?ran what is responsible for the most bird deaths? a. Moving vehicles b. Building window strikes c. Communications towers d. Wind turbines c. Hunting 4. What fraction of the world's electrical capacity comes from wind? a. About 1-2% About 3-4% About 7-8% About 9-10% More than 10% c 10. Scandinavian countries can casily experience the d. temperature ranges of -20°C and +20C between winter and summer months. What is the impact varying temperature on electricity generation of S As early as 200 B.C., wind power was used in 410Explanation / Answer
5) In early days, grinding grains and drawing water from earth was the main task of wind turbines. Hence option (b) is correct.
6)states generating electricity, Texas(12753MW), California (5829MW),Iowa(5177MW). As given option is not matching but option (b) is somewhat correct. Hence option(b) .
7) Horizontal axis type wind turbines produce more electricity, used worldwide, Dutch windmill was also horizontal type. Hence all are correct.
8) all options are correct except option (d).
9) According to US fish and wilfwild department, nearly 140,000 to 500,000 collision per year with wind turbines. Hence main cause wind turbines, option (d).
10) incomplete question.
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