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Waste Water Engineering problems

  • 1. In the activated sludge process

  • Options
  • A. aeration is continued till stability
  • B. aeration is done with an admixture of previously aerated sludge
  • C. sludge is activated by constant stirring
  • D. water is removed by centrifugal action.
    • Discuss
  • 2. Drop manholes are the manholes

  • Options
  • A. without entry ladders
  • B. without manhole covers
  • C. with depths more than 3.5 m
  • D. having drains at different levels.
    • Discuss
  • 3. The suitable cross-section of sewers to carry combined flow, is

  • Options
  • A. circular
  • B. egg shaped
  • C. rectangular
  • D. horse shoe shaped.
    • Discuss
  • 4. The sewerage system consists of

  • Options
  • A. house sewer
  • B. lateral sewer
  • C. branch sewer
  • D. main sewer
  • E. all of these.
    • Discuss
  • 5. The discharge per unit plan area of a sedimentation tank, is generally called

  • Options
  • A. over flow rate
  • B. surface loading
  • C. over flow velocity
  • D. all the above.
    • Discuss
  • 6. The value of Chezy's constant
    Civil Engineering Waste Water Engineering: The value of Chezy's constant
    is used in

  • Options
  • A. Chezy's formula
  • B. Bazin's formula
  • C. Kutter's
  • D. Manning's formula.
    • Discuss
  • 7. In areas where rainy season is limited to a few months, the type of sewerage system recommended is

  • Options
  • A. combined system
  • B. partially separate system
  • C. separate system
  • D. none of these.
    • Discuss
  • 8. Pick up the correct statement from the following :

  • Options
  • A. anaerobic bacteria flourish in the absence of oxygen
  • B. aerobic bacteria flourish in the presence of oxygen
  • C. facultative bacteria flourish with or without oxygen
  • D. all the above.
    • Discuss
  • 9. The sewers

  • Options
  • A. must be of adequate size to avoid over flow
  • B. must flow under gravity to full
  • C. must be laid at least 2 to 3 m deep to collect /water from the basements
  • D. all the above.
    • Discuss
  • 10. For detecting the nitrites in the sewage, the matching colour may be developed by adding

  • Options
  • A. Pottassium permanganate
  • B. Sulphuric acid and napthamine
  • C. Phenol-di-sulphuric acid pottassium hydroxide
  • D. None of these.
    • Discuss

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