Q. In sewers the highest non-scouring velocity is achieved in

View solution

Q. In sewage having fully oxidised organic matter, the nitrogen exists in the form of

View solution

Q. It is customary to design a sewer for D.W.F. on the basis of

View solution

Q. During preliminary treatment of a sewage

View solution

Q. Pick up the correct statement from the following :

View solution

Q. The most dangerous pollutant in vehicular emissions is

View solution

Q. 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

View solution

Q. The clarigesters are

View solution

Q. Rate of flow of sewage is generally assumed

View solution

Q. Maximum permissible velocity 1.5 m/sec, is adopted in drains

View solution

Q. For design purposes, the normal rate of infiltration of ground water into the sewer, is

View solution

Q. The effluent of a septic tank is

View solution

Q. The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/t+60 the maximum run off is

View solution

Q. The detention period for plain sedimentation water tanks, is usually

View solution

Q. 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

View solution

Q. Pick up the correct statement from the following :

View solution

Q. In sewers the gas generally found, is

View solution

Q. A sewer running partially full and hurried with back filled, fails in compression due to

View solution

Q. A manhole is classified as shallow if its depth is between

View solution

Q. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

View solution