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What does TSR stand for in design consideration of wind mills?

(a) Tip speed ratio

(b) Torque-synchronous ratio

(c) Tip suspension ratio

(d) Temporary speed restriction

The question was asked in a national level competition.

I need to ask this question from Horizontal Axis Wind Mill in section Wind Energy of Energy Engineering

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Right answer is (a) Tip speed ratio

Easiest explanation: The tip speed ratio, X, or TSR for wind turbines is the ratio between the tangential speed of the tip of a blade and the actual speed of the wind. The tip speed ratio is related to efficiency, with the optimum varying with blade design.

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