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Turbines with how many propellers are used in order to avoid vibrations?

(a) 1

(b) 2

(c) 3

(d) 4

The question was asked in an interview for job.

My question is from Horizontal Axis Wind Mill in division Wind Energy of Energy Engineering

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Correct choice is (c) 3

Explanation: Turbines with three blades are used to avoid vibrations that occur due to the turning or yawing of the rotor in order to face in into the wind. However, this problem can be overcome by controlling the yaw rate.

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