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  • Question

  • 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.

  • Correct Answer
  • aeration is done with an admixture of previously aerated sludge 

    • Waste Water Engineering problems

    Search Results

    • 1. The minimum diameter of sewer to be adopted is

    • Options
    • A. 10 cm
    • B. 12.5 cm
    • C. 15 cm
    • D. 25 cm.
      • Discuss
    • 2. The minimum diameter of a sewer is kept

    • Options
    • A. 10 cm
    • B. 15 cm
    • C. 20 cm
    • D. 25 cm
    • E. 30 cm.
      • Discuss
    • 3.  rd or th extra space is left in sewer pipes at maximum discharge for

    • Options
    • A. low estimates of the average and maximum flows
    • B. large scale infiltration of storm water
    • C. unexpected increase in population
    • D. all the above.
      • Discuss
    • 4. Antisyphonage pipe is fitted

    • Options
    • A. at the end of septic tanks
    • B. on manholes
    • C. with a W.C. trap
    • D. at the beginning of sewer line.
      • Discuss
    • 5. The rational formula for peak drainage discharge, was evolved by

    • Options
    • A. Fruhling
    • B. Lloyd David
    • C. Kuichling
    • D. All of these.
      • Discuss
    • 6. 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
    • 7. The suitable cross-section of sewers to carry combined flow, is

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

    • Options
    • A. house sewer
    • B. lateral sewer
    • C. branch sewer
    • D. main sewer
    • E. all of these.
      • Discuss
    • 9. 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
    • 10. 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

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