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With upto how many propellers can windmills are built?(a) 4(b) 2(c) 7(d) 6The question was posed to me in a job interview.Question is taken from Horizontal Axis Wind Mill in chapter Wind Energy of Energy Engineering

Answer»

Right choice is (d) 6

Best EXPLANATION: Wind turbines have been built with upto six PROPELLERS type blades but two and THREE bladed propellers are most common. A one bladed rotor with a balancing counter weight has some advantages, including lower weight and cost and simpler CONTROLS, over the multi-bladed type.



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