Question

The depth of an enclosed tank of a rapid sand filter lies in the range of  ______

(a) 1-2m

(b) 2.5-3.5m

(c) 2-5m

(d) 3-5m

I have been asked this question during an online interview.

Query is from Rapid Sand Filter topic in section Filtration of Environmental Engineering

Answer 1

The correct answer is (b) 2.5-3.5m

For explanation I would say: The depth of an enclosed tank of a rapid sand filter lies in the range of 2.5-3.5m and its surface area lies between 20-50m^2.