Setting out the alignments of sewers may start from__________________?
(A) City
(B) Out-fall
(C) Tail end
(D) Any point
The most widely used pump for lifting sewage is_________________?
(A) Centrifugal pump
(B) Reciprocating pump
(C) Pneumatic ejector
(D) Air pressure pump
Lead caulked joints are used for laying____________________?
(A) Stone ware pipes
(B) Earthenware pipes
(C) C.I. pipes
(D) G.I. pipes
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________?
(A) 50 ppm
(B) 100 ppm
(C) 150 ppm
(D) 200 ppm
The pH value of fresh sewage is usually ______________________?
(A) Equal to 7
(B) More than 7
(C) Less than 7
(D) Equal to zero
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is ____________________?
(A) 20 mm
(B) 30 mm
(C) 40 mm
(D) 50 mm
The sewer pipes__________________?
(A) Carry sewage as gravity conduits
(B) Are designed for generating self-cleansing velocities at different discharge
(C) Should resist the wear and tear caused due to abrasion
(D) All the above
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?
(A) 0.05552 cumec
(B) 0.05554 cumec
(C) 0.05556 cumec
(D) 0.0556 cumec
The temperature affects the________________?
(A) Biological activity of bacteria in sewage
(B) Solubility of gases in sewage
(C) Viscosity of sewage
(D) All the above
For large sewers, maximum distance between manholes may be_______________?
(A) 50 m
(B) 100 m
(C) 200 m
(D) 300 m