If the velocity of wind is doubled then the power output will

• A. increase by 6 times
• B. reduced to half
• C. doubled
• D. increase by 8 times

Answer: (D)

For the cut-in speed is the point at which the wind turbine is able to generate power.
Between the cut-in speed and the rated speed, where the maximum output is reached, the power output will increase cubically with wind speed.
Pmax directly propotional to cubical of wind speed.
So, by double the speed of wind power will be increased by 8 times.