10. In the formula Pm\" = qg -wgen?, what is the value of q_9? (answer in kg m2) 1 point Enter answer here 11. The maximum tip speed of the wind turbine blades is 70 mls. What is the maximum rotational speed mm\" of 1 point the generator? (answer in rad/s) Enter answer here 12. At which speed is maximum power point tracking not possible anymore because Um, is limited to 70 m/s 1 point (corresponding to point C)? Hint: L'H'l/fdewmm7 with the gear ratio, GR to get wWTRmam- Then calculate the U0 value (m/s). Enter answer here Variables Values comm (minimum rotational speed) 9001mm GR (gear ratio) 108 012me (maximum power coefficient) 0.42 2-" (rotor radius) 40m p (air density) 1.225kg/m3 A (tip speed ratio) 8.8 'Utip(moa:) 70m/s 1. Please 1 point read the document 'Introduction to quiz} which contains all the information you need to solve the quiz questions. when typing your results, please use '.' as decimal separator: The Q3, q5, (17, (19 are unknowns. Data 7 D a g _ D. '5 c E 0) s: , 8 B A | Generator rotational speed Question 1. The minimum rotational speed of the generator is 900 rpm (rotations per minute) in the operation range A-B. What is the value of cumin in rad/s? 94.25 The wind turbine has a gearbox between the wind turbine rotor and the generator to ensure that the generator rotates faster than the wind turbine rotor. The gear ratio ofthe wind turbine in this exercise is 108. What is the rotational speed of the wind turbine rotor wWTRmz'n in the operation range A-B (picture from question 1)? (answer in rad/s) 0.87 1 point 5. The maximum power coefficient is obtained with the tip speed ratio Jopt = 8.8. What is the relation between 1 point rotational speed WWTR and wind speed U in the operation range B-C? O U = q5 . WWTR O U = 95 . WWTR O U = q5 . WWTR O U = 95 . WWTR 6. In the formula U = q5 . WWTR , what is the value of 95 ? (answer in m) 1 point 4.557. The maximum power coefficient is obtained with the tip speed ratio 8.8. How does the maximum possible 1 point power Pmax depend on the wind turbine rotor speed WWTR in the operation range B-C (picture from question 1)? O Pmax = 97 . WWTR O Pmax = 97 . WWTR O Pmax = 97 . WWTR O Pmax = 97 . WWTR 8. In the formula Pmax = 97 . WWTR , what is the value of q7? (answer in kg m2) 1 point 30248.59. How does the maximum possible power Pmax depend on the generator rotor speed Wgen in the operation 1 point range B-C (picture from question 1)? O Pmax = 99 . Wgen O Pmax = q9 . Wgen 2 O Pmax = 99 . Wgen O Pmax = 99 . Wgen 4