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A 10 MW wind turbine generator has an overall mechanical to electrical efficiency of wind energy conversion of about 40% at 12 m/s average wind speed. The air density at

the hub height is 1.2 kg/m3. The blade length of such a wind turbine is approximately: (а) 50 m (b) 65 m (c) 75 m (d) 88 m (е) 100 m

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