This quiz works best with JavaScript enabled. Home > Ugc Net > Paper 1 > Environment > Wind Energy – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Wind Energy Quiz 4 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Electric current is the flow of ..... A) Electrons. B) Protons. C) Neutrons. D) Both protons and neutrons. Show Answer Correct Answer: A) Electrons. 2. About how many countries use wind energy? A) About 60. B) Every country. C) Only the US. D) About 100. Show Answer Correct Answer: A) About 60. 3. A wind turbine has average power output P. If the blade length of the turbine is tripled, what is the new average power? A) 9P. B) 27P. C) P/3. D) 3P. Show Answer Correct Answer: A) 9P. 4. What is one downside of wind-turbine as an energy source? A) It is not sustainable. B) It creates greenhouse gases. C) It has a high up-front cost. D) None of these. Show Answer Correct Answer: C) It has a high up-front cost. 5. ..... turn wind power into electricity A) Wind turbines. B) Rotors. C) Generators. D) Fossil fuels. Show Answer Correct Answer: A) Wind turbines. 6. Maximum axial thrust occurs when interference angle is A) 0.5. B) 0.33. C) 1. D) 0. Show Answer Correct Answer: A) 0.5. 7. What instrument measures wind direction A) Velocity meter. B) Anemometer. C) Wind turbine. D) Wind vane. Show Answer Correct Answer: D) Wind vane. 8. When multiple utility scale wind turbines are placed together they are referred to as: A) Wind group. B) Wind farm. C) Wind turbines. D) Wind gathering. Show Answer Correct Answer: B) Wind farm. 9. Wind turbines generate electricity as the wind rotates its ..... A) Bottom. B) Top. C) Blades. D) None of above. Show Answer Correct Answer: C) Blades. 10. How Does A Wind Turbine Make Electricity? A) They Raise Water That Then Flows Downhill. B) The Spinning Blades Turn A Shaft That Connects To Generator. C) Robots Inside Do Push-Ups Inside. D) Tiny Elves Inside The Blades Run On Treadmills. Show Answer Correct Answer: B) The Spinning Blades Turn A Shaft That Connects To Generator. 11. The amount of energy available in the wind at any instant is proportional to A) (Wind speed)1/2. B) Wind speed. C) (Wind speed)3. D) (Wind speed)2. Show Answer Correct Answer: C) (Wind speed)3. 12. What number of blades would probably be best on a windmill that was pumping water or grinding grain? A) 2 blades. B) 6 blades. C) 4 blades. D) 8 blades. Show Answer Correct Answer: C) 4 blades. 13. To generate lift, a blade is angled so the ..... pressure air moves under the blade. A) High. B) Low. C) Not enough information. D) None of the above. Show Answer Correct Answer: A) High. 14. The device/equipment used to harvest the aerodynamic force from the wind and convert it into electrical energy is called: A) Wind screen. B) Wind turbine. C) Wind farm. D) Wind down. Show Answer Correct Answer: B) Wind turbine. 15. Yawing is when a wind turbine: A) Turns to face the wind. B) Slows down when wind speed decreases. C) Creates noise as its blades rotate. D) Experiences stress from the force of the wind. Show Answer Correct Answer: A) Turns to face the wind. 16. 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$^{-3}$) A) 11 m. B) 1.8 m. C) 3.6 m. D) 5.8 m. Show Answer Correct Answer: C) 3.6 m. 17. The law which determines windmill's possible efficiency is called A) The Bernoulli Principle Law. B) Betz's Law. C) Windmill Efficiency Law. D) None of the above. Show Answer Correct Answer: B) Betz's Law. 18. Which state produces the most wind energy? A) Iowa. B) California. C) Texas. D) Indiana. Show Answer Correct Answer: C) Texas. 19. In a windmill blade, drag is A) Upwards/perpendicular force. B) Resistance. C) Not important. D) None of the above. Show Answer Correct Answer: B) Resistance. 20. This type of wind turbine typically transmits power only to the end user: A) Small scale. B) Utility scale. C) Commercial scale. D) Large scale. Show Answer Correct Answer: A) Small scale. 21. What happens to the movement of particles as they cool down? A) They slow down. B) Nothing. C) They speed up. D) They don't move. Show Answer Correct Answer: A) They slow down. 22. Who is the leading country in the wind energy industry A) Germany. B) China. C) Us. D) India. Show Answer Correct Answer: B) China. 23. What is called the cooler air that rushes to fill the space left by hot air leaving when temperature rises? A) Current. B) Gas. C) Water. D) Wind. Show Answer Correct Answer: D) Wind. 24. What would be one easy way to increase the amount of torque a wind turbine produces? A) Increase the height of the turbine. B) Decrease the height of the turbine. C) Increase the length of the rotor blades. D) Decrease the length of the rotor blades. Show Answer Correct Answer: C) Increase the length of the rotor blades. 25. Con of wind turbines A) Harmful to humans. B) Renewable energy. C) Cost effective. D) Rapid growth. Show Answer Correct Answer: A) Harmful to humans. 26. How do wind turbines affect the environment. A) Can harm birds and other wildlife. B) Cuts the clouds which affects the water cycle. C) Hits trees around them. D) They are perfect for the environment. Show Answer Correct Answer: A) Can harm birds and other wildlife. 27. A wind turbine designed to come into operation at a minimum wind speed is called A) Cut out velocity. B) Cut in velocity. C) Windward. D) Upwind. Show Answer Correct Answer: B) Cut in velocity. 28. Hydroelectric power plants are mainly used to produce- A) Energy for transportation. B) Electricity. C) Heat for homes. D) Power for industries. Show Answer Correct Answer: B) Electricity. 29. What device monitors the direction of wind? A) Compass. B) Weather Vane. C) Hair. D) Thermometer. Show Answer Correct Answer: B) Weather Vane. 30. A large wind turbine can power how many homes when the wind is blowing? A) 250. B) 500. C) 1000. D) None of above. Show Answer Correct Answer: B) 500. ← PreviousNext →Related QuizzesPaper 1 QuizzesUgc Net QuizzesWind Energy Quiz 1Wind Energy Quiz 2Wind Energy Quiz 3Wind Energy Quiz 5Wind Energy Quiz 6Wind Energy Quiz 7Wind Energy Quiz 8Wind Energy Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books