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  • Question

  • The sewers


  • Options
  • A. must be of adequate size to avoid over flow
  • B. must flow under gravity The sewers must be of adequate size to avoid over flow must flow under gravity to full must be laid to The sewers must be of adequate size to avoid over flow must flow under gravity to full must be laid full
  • C. must be laid at least 2 to 3 m deep to collect /water from the basements
  • D. all the above.

  • Correct Answer
  • all the above. 

    • Waste Water Engineering problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. The sewerage system consists of

    • Options
    • A. house sewer
    • B. lateral sewer
    • C. branch sewer
    • D. main sewer
    • E. all of these.
      • Discuss
    • 6. 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
    • 7. Aerobic activity is maximum

    • Options
    • A. in freshly produced sewage
    • B. at sewer pipes
    • C. in sewer treatment plants
    • D. none of these.
      • Discuss
    • 8. Hazin's formula is used for the settlement velocity of the particles of diameter

    • Options
    • A. less than 0.01 mm
    • B. less than 0.05 mm
    • C. less than 0.1 mm
    • D. greater than 0.1 mm.
      • Discuss
    • 9. If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula evolved by

    • Options
    • A. Chezy
    • B. Manning
    • C. Bazin
    • D. Kutter.
      • Discuss
    • 10. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

    • Options
    • A. 2 hours
    • B. 4 hours
    • C. 6 hours
    • D. 8 hours.
      • Discuss

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