A sewer running partially full and hurried with back filled, fails in compression due to_________________?
(A) Weight of the pipe
(B) Weight of the back fill
(C) Superimposed traffic loads
(D) All the above
Kjeldahl nitrogen is a mixture of___________________?
(A) Ammonia and nitrogen
(B) Nitrogen and organic nitrogen
(C) Organic nitrogen and ammonia
(D) All the above
Nitrogen cycle of sewage, is____________________?
(A) Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
(B) Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
(C) Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
(D) Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Stone ware pipes are_______________?
(A) Highly resistant to sulphide corrosion
(B) Highly impervious
(C) Hydraulically efficient because of their smooth interior surface
(D) Especially suited to pressure pipes
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?
(A) 1.095
(B) 1.085
(C) 1.075
(D) 1.065
Drop manholes are the manholes___________________?
(A) Without entry ladders
(B) Without manhole covers
(C) With depths more than 3.5 m
(D) Having drains at different levels
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?
(A) 200 ppm
(B) 225 ppm
(C) 250 ppm
(D) None of these
The sewers___________________?
(A) Must be of adequate size to avoid over flow
(B) Must flow under gravity ½ to ¾ full
(C) Must be laid at least 2 to 3 m deep to collect /water from the basements
(D) All the above
In a fully mechanised composting plant, involves________________?
(A) Mechanized receipt
(B) Mechanized segregation
(C) Mechanized pulverising of refuse
(D) All of these
weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?
(A) w r S S
(B) w r1/2
(C) w r S
(D) w r2/3