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The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________? A. 0.9 cm B. 1.2 m C. 1.5 mD. > 1.5 m
Lead caulked joints are used for laying____________________? A. Stone ware pipesB. 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 ppmD. 200 ppm
The pH value of fresh sewage is usually ______________________? A. Equal to 7B. 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 mmD. 50 mm
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 cumecC. 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 sewageD. All the above
Sludge banks are formed if sewage is disposed of in____________________ ? A. RiversB. Seas C. Lakes D. None of these
Chlorination of water is done for the removal of____________________? A. Bacterias B. Suspended solids C. Sediments D. Hardness
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________? A. Inverted syphon B. Depressed sewer C. Sag pipeD. all of these