Discussion
The coefficient of performance of a wind turbine for maximum power output is
Answer: C
The coefficient of performance of a wind turbine at maximum power output is given by the Betz limit, 16/27, which is about 0.593. It follows from momentum theory: the maximum power is extracted when the wind speed behind the rotor falls to one third of the speed ahead of it, and no turbine can capture more than 59.3 percent of the kinetic energy of the wind passing through it. The values 13/18, 5/8 and 11/17 are not the Betz limit.
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