Waste Water Engineering Questions

• Which one of the following part of human body withstands minimum radiation
• Which one of the following gases is most significant as air pollutant
• If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
• 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
• Which one of the following statements regarding septic tanks is wrong :
• Design period of 40 to 50 years is adopted for
• The most widely used pump for lifting sewage is
• The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
• The sludge does not contain waste water from
• The self-cleansing velocity of water flowing through pipe lines, is
• The spacing of bars of perforations of fine screens used for the treatment of sewage, is
• Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
• The water carried sewerage system removes
• The design period in years for pumping plants, is
• The Chezy's constant C in the formula V = C rs depends upon
• Water content of sewage is about
• For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed
• Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
• If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is
• For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is