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  • Question

  • 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.

  • Correct Answer
  • 8 hours. 

    • Waste Water Engineering problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Aerobic activity is maximum

    • Options
    • A. in freshly produced sewage
    • B. at sewer pipes
    • C. in sewer treatment plants
    • D. none of these.
      • Discuss
    • 4. 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
    • 5. 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
    • 6. The settlement of a particle in sedimentation tank, is affected by

    • Options
    • A. velocity of flow
    • B. viscosity of water
    • C. size and shape of solid
    • D. specific gravity of solid
    • E. all the above.
      • Discuss
    • 7. Sewer manholes are generally provided at

    • Options
    • A. the change of gradient
    • B. the change of direction
    • C. the junctions of sewers
    • D. all of these.
      • Discuss
    • 8. The laying of sewers is done with

    • Options
    • A. magnetic compass
    • B. theodolite
    • C. level
    • D. clinometer
    • E. plane table.
      • Discuss
    • 9. For drains up to 15 cumecs, the depth d and width B are related by

    • Options
    • A. d = 0.2 B
    • B. d = 0.5 B
    • C. B = 0.2 d
    • D. B = 0.5 d.
      • Discuss
    • 10. Pathogens (or pathogentic bacterias) in water may cause

    • Options
    • A. typhoid
    • B. cholera
    • C. dysentery
    • D. infectious hepatitis
    • E. all the above.
      • Discuss

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