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Why recommendation of fixed ratio gears done for top mounted equipment?

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Why recommendation of fixed ratio gears done for top mounted equipment?

(a) Because they are easy install

(b) Requires less space

(c) Due to its low cost

(d) Because of their high efficiency

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Question is from Components of Wind Energy Conversion System in section Wind Energy of Energy Engineering

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Right answer is (d) Because of their high efficiency

The best explanation: Fixed ratio gears are recommended for top mounted equipment because of their high efficiency, and minimum system risk. For bottom mounted equipment requiring a right angle drive transmission costs can be reduced on the hub by increasing rotor speed to generator.

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