Question: (a) Define the term 'Tip Speed Ratio' () and discuss its importance to the efficient extraction of energy from the wind by a horizontal axis

(a) Define the term 'Tip Speed Ratio' () and discuss its importance to the efficient extraction of energy from the wind by a horizontal axis wind turbine.

(b) Describe the mechanism of active pitch control as a means of controlling the power output from a wind turbine (use diagrams as appropriate).

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