Waste Water Engineering Questions

• The normal values of over flow rates for secondary sedimentation tanks, ranges between
• 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
• The following is the physical characteristic of sewage
• Pick up the correct statement from the following :
• The underground sewers are more subjected to
• Pick up the correct statement from the following :
• The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
• For drainage pipes in buildings the test applied before putting them to use, is
• In normal conditions, the period for sludge digestion, is
• The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
• For efficient working of a sewer, it must be ensured that
• Pick up the correct statement from the following :
• In Chezy's formula V = C rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is
• Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is
• Cement concrete sewers are only suitable if non-scouring velocity is between
• The flow velocity in detritus tanks is
• The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
• R.M.O. expenses include
• If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
• A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is