Waste Water Engineering
Drop manholes are the manholes

Without manhole covers
Without entry ladders
Having drains at different levels
With depths more than 3.5 m

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

A sedimentation tank and an activated sludge treatment plant
None of these
A plant consisting of Imhoff tanks with low rate trickling filters
Sedimentation tanks with high rate trickling filters

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