Question

The head loss through screen depends on _______________

(a) Shape of screen elements

(b) Open area, block area

(c) Approach velocity

(d) Nature of their construction, approach velocity

I got this question during an interview.

Enquiry is from Types of Screens and Aerators topic in division Unit Operations, Screening and Aeration of Environmental Engineering

Answer 1

The correct option is (d) Nature of their construction, approach velocity

The explanation: The head loss through the screen is given by, h=B (w/b) 4/3h1*sinx Where h=head loss, h1=approach velocity head, b=minimum width, x=angle of rack, B=shape factor. It also depends on the nature of their construction.