According to Betz theory, the maximum possible power coefficient is 16/27 and 59% efficiency is the best conventional wind turbine can do in extracting power from the wind becausea. 100% efficiency is not possible due to fluid mechanics of windb. 100% efficiency can be extracted then the flow of air would be reduced to complete stop and no velocity would remain available to sustain flow through extraction mechanism.

• A. a is true, b is false
• B. Both a and b are true
• C. a is false, b is true
• D. Both a and b are false