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Which type of the following consists of single blade?

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in Energy Engineering by (91.0k points)
Which type of the following consists of single blade?

(a) Horizontal axis with two aerodynamic blades

(b) Horizontal axis propeller type wind mill

(c) Horizontal axis multi bladed type wind mill

(d) Sail type wind mill

The question was asked during an online interview.

This interesting question is from Horizontal Axis Wind Mill topic in portion Wind Energy of Energy Engineering

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Best answer
The correct option is (b) Horizontal axis propeller type wind mill

The best explanation: Horizontal axis propeller type wind mill consists of a long blade mounted on a rigid hub, induction generator and gear box. If extremely long blades are mounted on rigid hub, large blade root bending moments occur due to tower shadow, gravity and sudden shifts in wind directions.

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