Waste Water Engineering Questions

• Fresh sewage may become stale in
• The liquid wastes from kitchens, bath rooms and wash basins, is not called
• Rate of flow of sewage is generally assumed
• Which one of the following tests is used for testing sewer pipes :
• Hydraulic mean radius is
• A sewer running partially full and hurried with back filled, fails in compression due to
• In septic tanks,
• To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
• The sewer pipe which carries sewage from a building for immediate disposal is
• A manhole is classified as shallow if its depth is between
• If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
• It is customary to design a sewer for D.W.F. on the basis of
• The detention period for plain sedimentation water tanks, is usually
• Sewer ventilating columns are generally placed at
• In case of Imhoff tanks,
• Pick up the correct statement from the following :
• In sewers the highest non-scouring velocity is achieved in
• The standard B.O.D. of water is taken for
• The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
• The digested sludge from septic tanks, is removed after a maximum period of