A. Bacterias
B. Suspended solids
C. Sediments
D. Hardness
A.p = Txr
B.p = T/r
C. p = T/2r
D. p = 2T/r
E. none of the above
A. In freshly produced sewage
B. At sewer pipes
C. In sewer treatment plants
D. None of these
A. D
B. 1.25 D
C. 1.5 D
D. 1.75 D
A. Ammonia and nitrogen
B. Nitrogen and organic nitrogen
C. Organic nitrogen and ammonia
D. All the above
A. Circular septic tanks
B. Rectangular septic tanks
C. Circular Imhoff double tanks with bottom hoppers
D. Circular Imhoff double storey tanks without bottom hoppers
A. the meta-center should lie above the center of gravity
B. the center of buoyancy and the center of gravity must lie on the same vertical line
C. a righting couple should be formed
D. all the above are correct
E. none of the above is correct