This quiz works best with JavaScript enabled. Home > Ugc Net > Paper 1 > Environment > Wind Energy – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Wind Energy Quiz 8 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Some modern turbines exploit the advantages of both the pitch and stall controlled options for regulating its power. This is called the ..... A) Active stall controlled power regulation. B) Bi-stall Controlled power regulation. C) Pitch-stall controlled power regulation. D) None of above. Show Answer Correct Answer: A) Active stall controlled power regulation. 2. Which option is better for a wind pump? A) 3 blades. B) 8 blades. C) 1 blade. D) 2 blades. Show Answer Correct Answer: B) 8 blades. 3. Select the wrong statement of DOUBLE ACTING PUMP A) Using double acting pumps is one possible way for reducing the high starting torque of wind driven reciprocating pumps. B) The torque demand is varying nature. C) The double acting pump discharges during both its upward and downward strokes and thus offers a continuous flow. D) The torque demand is more uniform. Show Answer Correct Answer: B) The torque demand is varying nature. 4. Tidal changes come how many times a day? A) 2. B) 4. C) 6. D) None of above. Show Answer Correct Answer: B) 4. 5. The cross section of most wind turbine blades are shaped like: A) Rectangles. B) Whale fins. C) Teardrops or Airfoils. D) Circle. Show Answer Correct Answer: C) Teardrops or Airfoils. 6. What gas is the primary cause of global climate change? A) H$_{2}$O. B) H$_{2}$. C) CO$_{2}$. D) O$_{2}$. Show Answer Correct Answer: C) CO$_{2}$. 7. The main material that is used in the production of photovoltaic cells is ..... A) Hydrogen. B) Carbon. C) Silicon. D) Uranium. Show Answer Correct Answer: C) Silicon. 8. People used wind energy to propel boats across the Nile as early as: A) 3000 BC. B) 4000 BC. C) 5000 BC. D) 6000 BC. E) None of the above. Show Answer Correct Answer: C) 5000 BC. 9. Which country is currently not a leader in wind technology? A) Germany. B) Denmark. C) Spain. D) China. Show Answer Correct Answer: D) China. 10. What is the force that propels an object upward, or at a right angle to the direction of the air stream? A) Drag force. B) Stream force. C) Lift force. D) Air force. Show Answer Correct Answer: C) Lift force. 11. What scale ranks winds from 0-12 A) Bernoulli. B) Wind Anemometer. C) Beaufort. D) Faraway. Show Answer Correct Answer: C) Beaufort. 12. How fast can a wind turbines blade move A) Around 200mph. B) Around 25mph. C) Around 100mph. D) Around 150mph. Show Answer Correct Answer: A) Around 200mph. 13. Which of the following is an example of mechanical advantage? A) Placing a large gear near a rotor, then a smaller gear next to the larger one, to increase the speed of rotation. B) Placing equal sized gears near a rotor so that the speed of rotation is increased. C) Placing bigger gears near a rotor so that the speed of rotation is increased. D) None of these. Show Answer Correct Answer: A) Placing a large gear near a rotor, then a smaller gear next to the larger one, to increase the speed of rotation. 14. What continent did windmills spread through in the 12th century AD.? A) North America. B) Asia. C) Africa. D) Europe. Show Answer Correct Answer: D) Europe. 15. Pro of wind energy A) Renewable source. B) Loud. C) Harmful to animals. D) Harmful to humans. Show Answer Correct Answer: A) Renewable source. 16. Are wind turbines a clean energy source? A) No, they cause no pollution at all. B) It causes some pollution. C) It is very dirty and severely pollutes the air. D) None of above. Show Answer Correct Answer: A) No, they cause no pollution at all. 17. To move the windmill blades, the blades must be set at an angle so the ..... is greater than the ..... A) Pressure; speed. B) Speed; pressure. C) Lift; drag. D) Drag; lift. Show Answer Correct Answer: C) Lift; drag. 18. What part of a wind turbine makes the wind energy into electric energy? A) Staff. B) Blade. C) Wires. D) Generator. Show Answer Correct Answer: D) Generator. 19. If an electric heater supplies 200 joules of heat energy to a cup of water, but only 150 joules is actually absorbed by the water, the remainder is 'wasted' by heating the cup and the room, the percentage energy efficiency of this process is said to be: A) 100%. B) 25%. C) 50%. D) 75%. Show Answer Correct Answer: D) 75%. 20. The equation P =$^{1}$/$_{2}$ A p v$^{3}$ is a calculation of maximum power input and not real power input because ..... A) The blades do not turn at a constant speed. B) The air does not completely stop when it hits the blades. C) All of the air molecules will hit the blades. D) The blades may hit birds that fly too close. Show Answer Correct Answer: B) The air does not completely stop when it hits the blades. 21. Sea breezes occur? A) During the night. B) Full moon. C) High noon. D) During the day. Show Answer Correct Answer: D) During the day. 22. What is the best definition of a generator? A) A device that spins when exposed to wind. B) A device that conducts electrical current through a wire. C) A device that measures wind speed. D) A device that converts mechanical motion into electricity. Show Answer Correct Answer: D) A device that converts mechanical motion into electricity. 23. Which country is the world's largest producer for wind energy? A) China. B) United States of America. C) India. D) Germany. Show Answer Correct Answer: A) China. 24. Why is wind turbine designed to stop operation at cut out velocity? A) To improve the efficiency. B) To adjust the blades in wind direction. C) To make a quick stop in emergencies. D) To protect turbine against damage. Show Answer Correct Answer: D) To protect turbine against damage. 25. Which is a disadvantage of hydropower? A) It disrupts habitats and floods land. B) You can only use in areas with very high tides. C) It can injure birds and bats. D) Dams are very noisy and disrupt the view. Show Answer Correct Answer: A) It disrupts habitats and floods land. 26. In a windmill blade, lift is A) A(n) upwards/perpendicular force. B) Resistance. C) Not important. D) None of the above. Show Answer Correct Answer: A) A(n) upwards/perpendicular force. 27. What do wind turbines, hydro electric dams, and ethanol plants have in common A) All produce electrical current without pollution. B) All use generators to produce electrical current. C) All convert gravitational potential energy to electric current. D) All convert thermal energy to electrical energy. Show Answer Correct Answer: B) All use generators to produce electrical current. 28. What is Wind Energy? A) Electrical energy obtained from water currents . B) Electrical energy that is harnessed from the sun.. C) Electrical energy obtained from fossil fuels . D) Electrical energy obtained from harnessing the wind with windmills and wind turbines . Show Answer Correct Answer: D) Electrical energy obtained from harnessing the wind with windmills and wind turbines . 29. What energy creates the most air pollution? A) Natural Gas. B) Nuclear. C) Geothermal. D) Coal. Show Answer Correct Answer: D) Coal. 30. When the wind blows, the air movement is caused by: A) The movement of the Earth. B) The storms over the ocean. C) Day and night changes of sunlight. D) Local heating and cooling of the earth. Show Answer Correct Answer: D) Local heating and cooling of the earth. ← PreviousNext →Related QuizzesPaper 1 QuizzesUgc Net QuizzesWind Energy Quiz 1Wind Energy Quiz 2Wind Energy Quiz 3Wind Energy Quiz 4Wind Energy Quiz 5Wind Energy Quiz 6Wind Energy Quiz 7Wind Energy Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books