Waste Water Engineering Questions

• For evaporation and measurement of settlable solids, the apparatus used, is
• In sewers the effect of scouring is more on
• In olden days the type of section adopted in trunk and out fall sewers was
• For house drainage minimum gradient is
• For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
• If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
• The rate of accumulation of sludge in septic tanks is recommended as
• House connections to the laterals is generally made by
• If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
• The drop man holes are generally provided in sewers for
• In sewage having fully oxidised organic matter, the nitrogen exists in the form of
• For trunk and out-fall, the type of sewers generally used, is
• The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
• Dry water flow in a combined sewer, is
• Pick up the correct statement from the following :
• In sewers the gas generally found, is
• Maximum permissible velocity 1.5 m/sec, is adopted in drains
• The algae dies out in the zone of
• Pick up the correct statement from the following :
• If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is