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In the exposed lands, ______ are used to assist rotation during harsh weather conditions?

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In the exposed lands, ______ are used to assist rotation during harsh weather conditions?

(a) Wind vanes

(b) Water sprayer

(c) Flow bed

(d) Motor drives

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I'd like to ask this question from Biological Treatment of Waste Water topic in section Biological Treatment of Waste Water of Environmental Biotechnology

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The correct option is (a) Wind vanes

Easy explanation: Wind vanes present on the rotator helps in the assist rotation during harsh weather conditions to even out rotation speed, Water sprayer is used to spray the waste water on the filter bed, which tends to filter out the pollutants and waste, motor drives are used to maintain speed variations.

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