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Water Supply & Treatment

  • How the per capita water demand is calculated?
  • Why slow sand filters are more efficient in removal of bacteria than rapid sand filters.
  • Explain the various methods of forecasting population.
  • What are types of settling? In which case Stoke\'s law can be used to find terminal settling velocity of suspended particles?
  • What treatment is given to boiler feed water?
  • What velocity gradient is necessary for flocculation.
  • Why instant mixing of coagulant is necessary in coagulation?
  • Explain why tube settler is more efficient than normal radial flow settling tank.
  • Explain reasons for high rate of filtration in rapid sand filter as compared to slow sand filter.
  • Explain the role of Zeta Potential in coagulation of water.
  • What is the principle of designing dual and multimedia filters.
  • In aeration, Oxygen gets dissolved in water, whereas Carbon-di-Oxide is expelled from water. Why?
  • Why V notch plates are used along weir of circular selling tank?
  • Explain why tube settler is more efficient than normal radial flow settling tank.
  • What measures are necessary to reduce wastage of water in distribution system?
  • What is difference between water softening and demineralisation?
  • What is uniformity coefficient? What are its optimum values for different types of filters?
  • What are types of ion exchange resins? How to determine their ion exchange capacity.
  • What is principle of reverse osmosis?
  • What are the merits and demerits of 24/7 water supply system?
  • What is water hammer? How to prevent pipe failure due to water hammer?
  • What are limitations for effectiveness of UV disinfection?
  • Normal water treatment plants fail in treating polluted water. Explain reasons.
  • What are the reasons for algae and water hyacinth growth in rivers and surface water bodies?
  • What metods can be employed to control growth of algae in surface water bodies?
  • Explain why tube settler is more efficient than normal radial flow settling tank.
  • What measures are necessary to reduce wastage of water in distribution system?
  • What is uniformity coefficient? What are its optimum values for different types of filters?
  • What is meant by specific surface area? What is its value for Activated carbon.
  • What is time of concentration? How it affects runoff?