Title Wind Energy Objective Questions with Answer Key.pdf ✅

WIND ENRGY QUESTION WITH ANSWER KEY National Institute of Wind Energy, Chennai Page 1 of 22 1. Which is the country in top rank for manufacturing in wind turbines a) China b) India c) US d) UK 2. India Stands in which place in Wind Power Generation a) Fourth b) First c) Fifth d) Third 3. What is the Formula of Wind Power a) 1⁄2 ρ AV3 b) 1⁄2 βVA3 c) 1⁄2 ρVA2 d) 1⁄2 αVA3 6. What is the target framed by MNRE for Renewable Energy Capacity till the year 2022. a) 1,75 GW (Comprising 100 GW Solar, 60 GW Wind, 10 GW Biomass and 5 GW Small Hydro) b) 1,85 GW (Comprising 100 GW Solar, 65 GW Wind, 10 GW Biomass and 10 GW Small Hydro) c) 2,85 GW (Comprising 200 GW Solar, 65 GW Wind, 10 GW Biomass and 10 GW Small Hydro) d) 1,70 GW (Comprising 100 GW Solar, 55 GW Wind, 10 GW Biomass and 5 GW Small Hydro) 7. List out the applications of Wind Energy Ship propulsion (Yachting) - Grain Cleaning (Winnowing) - Grinding Grains - Water pumping - Wind surfing & kite-flying - Wind Electric Generation 8. What is the meaning of Rated Wind speed a) Speed at which Rotor start to produce rated power. b) Speed at which Blade produce rated power. c) Speed at which Wind Turbine produce rated power. 9. What is the meaning of Survival Wind Speed a) Turbine should stop rotating to start the potential. b) Turbine should stop rotating to stop from potential damage.
WIND ENRGY QUESTION WITH ANSWER KEY National Institute of Wind Energy, Chennai Page 2 of 22 c) Speed at which Wind Turbine produce rated power. d) At which turbine starts rotating. 12. What does anemometer read on the outside of the tower nacelle? a) Wind direction b) Humidity c) Wind speed 14. Which of these cause higher mortality among birds than do wind turbine a) Buildings / Windows b) Vehicles c) House Cats d) Pesticides e) All of the above 15. A Wind Turbine noise level have been tested to be between 35 to 45 decibels, which is louder than a) An airplane flying overhead b) A whisper c) Inside of a car while driving d) Industrial sounds 16. Energy available in the wind is directly proportional to Square of wind velocity (V2 ) Cube of wind velocity (V3 ) Wind velocity (V) None of the above 17. Betz limit is 0.833 0.385 0.727 0.593 18. Which Component converts kinetic energy in the wind to mechanical energy? Generator Rotor (Blades & Hub) Gearbox Tower 19. Which material is normally used for blades of MW scale wind turbines? Composites (GFRP/CFRP) Steel
WIND ENRGY QUESTION WITH ANSWER KEY National Institute of Wind Energy, Chennai Page 3 of 22 Cast Iron None of the above 20. Which System turns the whole length of the rotor blades along the longitudinal axis? Yaw System Pitch System Cooling System All the above 21. Which System turns the nacelle and the rotor about the vertical tower axis? Yaw System Pitch System Cooling System All the above 22. What is the reference wind speed (10 minute average, 50 year recurrence period) for Class I wind turbine? 50 m/sec 100 m/sec 120 m/sec 150 m/sec 23. Which system is used for aerodynamic braking / Soft braking? Yaw System Pitch System Cooling System None of the above 24. Wind turbine that transforms mechanical energy in to electrical energy by Rotor Gearbox Generator Main shaft 25. Classifications of wind turbines from the electrical power generation point of view fixed speed turbines variable speed turbines Both a& b synchronous generators 26. Which type is Synchronous generator Rotor Squirrel cage induction generator (SCIG) Opti-slip induction generator (OSIG)
WIND ENRGY QUESTION WITH ANSWER KEY National Institute of Wind Energy, Chennai Page 4 of 22 Wound rotor generator (WRSG) & Permanent magnet generator (PMSG). Induction generator (IG) 27. The speed of the rotating magnetic field Ns for 4 pole is 1500 RPM 1200 RPM 1000 RPNM 750 RPM 28. The amount of energy available in the wind at any instant is proportional to ___ of the wind speed. Square root power of two Square root power of three Square power Cube power 29. The following factor(s) affects the distribution of wind energy Mountain chains The hills, trees and buildings Frictional effect of the surface All of the above 30. Low solidity rotors use which of the following force for rotation Drag Lift Centrifugal Centripetal 31. Turbines blades have ____ type cross section to extract energy from wind. Aerofoil Elliptical Rectangular All of the above 32. Which Component will step up the speed of rotor to speed suitable for generator? Generator Rotor (Blades & Hub) Gearbox Tower 33. Wind Turbine Main Gearbox is considered as Class ___ Component. Class 1 Class 2
WIND ENRGY QUESTION WITH ANSWER KEY National Institute of Wind Energy, Chennai Page 5 of 22 Class 3 None of the above 34. Which one of the gearbox component achieves the stepping up of rotor speed? Gears Torque arm housing None of the above 35. Which material property is related to pitting failure (Pits on surface of gears)? Tensile strength Compression strength Surface durability None of the above 36. Apart from main gearbox, which system of wind turbine uses gearbox? Hydraulic System Pitch System Cooling System None of the above 37. How many number of gear stages would be present normally in MW class wind turbines? Single Stage Two Stage Multi stages (3 or 4 or above) None of the above 38. What is the advantage of using epi-cyclic (planetary) gear stage in a gearbox? High gear ratio with less space (Compact size) Large Size No advantage Complex design 39. Which failure is related to the sudden rise in temperature inside a gearbox? Scuffing Pitting Bending None 40. Which will help to maintain gear and bearing alignment? Adequate Stiffness of Shaft lubricant