The underground sewers are more subjected to________________?
(A) Tensile force
(B) Compressive force
(C) Bending force
(D) Shearing force
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?
(A) 20 m
(B) 30 m
(C) 45 m
(D) 75 m
The maximum diameter of sewers adopted in the designs is_______________?
(A) 1.0 m
(B) 2.0 m
(C) 3.0 m
(D) 4.0 m
The formula V = (1/n) r2/3____________________?
(A) Chezy’s formula
(B) Bazin’s formula
(C) Kutter’s formula
(D) Manning’s formula
The first stage of neutral process of sludge digestion, is__________________?
(A) Acid fermentation
(B) Acid regressio
(C) Alkaline fermentation
(D) None of these
The self-cleansing velocity of water flowing through pipe lines, is___________________ ?
(A) 2 metres/sec
(B) 1 metre/sec
(C) 0.5 metre/sec
(D) 0.25 metre/sec
In very first stage of decomposition of the organic matter in sewage________________?
(A) Nitrites are formed
(B) Nitrates are formed
(C) Carbondioxide is formed
(D) Ammonia is formed
The effluent of a septic tank is_________________?
(A) Fit for discharge into any open drain
(B) Foul and contains dissolved and suspended solids
(C) As good as that from a complete treatment
(D) None of these
The detention time (t) of a settling tank, may be defined as the time required for_________________?
(A) A particle to travel along its length
(B) A particle to travel from top surface to bottom sludge zone
(C) The flow of sewage to fill the tank
(D) None of these
The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?
(A) Liquid waste
(B) Sullage
(C) Sewage
(D) None of these