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  • Question

  • Primary treatment of sewage consists of removal of


  • Options
  • A. large suspended organic solids
  • B. oil and grease
  • C. sand and girt
  • D. floating materials
  • E. none of these.

  • Correct Answer
  • large suspended organic solids 

    • Waste Water Engineering problems

    Search Results

    • 1. In trickling filter, B.O.D. is reduced to

    • Options
    • A. 30 to 40%
    • B. 40 to 60%
    • C. 60 to 80%
    • D. 80 to 90%
    • E. 95%.
      • Discuss
    • 2. Pick up the correct statement from the following :

    • Options
    • A. The water supply pipes carry pure water free from solid particles
    • B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
    • C. The sewers may be carried up and down the hills and valleys
    • D. The sewer pipes are generally laid along level hills
    • E. None of these.
      • Discuss
    • 3. For large sewers, maximum distance between manholes may be

    • Options
    • A. 50 m
    • B. 100 m
    • C. 200 m
    • D. 300 m
    • E. 400 m.
      • Discuss
    • 4. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is

    • Options
    • A.
    • B.
    • C.
    • D. ?D.
      • Discuss
    • 5. The use of coarse screens for the disposal of sewage, may be dispensed with by

    • Options
    • A. comminutor
    • B. shredder
    • C. both (a) and (b)
    • D. neither (a) nor (b).
      • Discuss
    • 6. The pH value of sewage is determined with the help of

    • Options
    • A. Imhoff Cone
    • B. turbidimeter
    • C. potentiometer
    • D. none of these.
      • Discuss
    • 7. Stoneware sewers are available in size

    • Options
    • A. 10 cm
    • B. 15 cm
    • C. 20 cm
    • D. 25 cm
    • E. all the above.
      • Discuss
    • 8. Inter-distance between ventilation columns in a sewer line is kept

    • Options
    • A. 25 to 50 m
    • B. 50 m to 100 m
    • C. 100 m to 150 m
    • D. 150 m to 300 m.
      • Discuss
    • 9. Ventilating shafts are provided to a sewer line at every

    • Options
    • A. 100 m
    • B. 150 m
    • C. 200 m
    • D. 300 m
    • E. 500 m.
      • Discuss
    • 10. For the open drain (N = 0.025) shown in the below figure, the discharge is

    • Options
    • A. 26.88 cumecs
    • B. 27.88 cumecs
    • C. 28.88 cumecs
    • D. 29.88 cumecs.
      • Discuss

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