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Which windmill blades are made by an array of wooden slats?

(a) Horizontal axis with two aerodynamic blades

(b) Horizontal axis propeller type wind mill

(c) Horizontal axis multi bladed type wind mill

(d) Horizontal axis wind mill Dutch type

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The doubt is from Horizontal Axis Wind Mill in portion Wind Energy of Energy Engineering

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The correct choice is (d) Horizontal axis wind mill Dutch type

For explanation: Dutch type wind mill is one of the oldest wind mills in designs. The blade surfaces are made from an array of wooden slats which rotates at high wind speeds. These types of wind mill are cheap to build since the wood is made use of to build.

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