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Civil Engineering :: Waste Water Engineering

  1. ¾th or ¼th extra space is left in sewer pipes at maximum discharge for

  2. 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


  3. In detritus tanks,

  4. A.

     Flow velocity is kept 0.09 m/sec

    B.

     Detention period is kept 3 to 4 minutes

    C.

     Organic and inorganic materials are separated

    D.

     All the above


  5. Kjeldahl nitrogen is a mixture of

  6. A.

     Ammonia and nitrogen

    B.

     Nitrogen and organic nitrogen

    C.

     Organic nitrogen and ammonia

    D.

     All the above


  7. The intensity of rain is expressed in

  8. A.

     cm/minute

    B.

     cm/hour

    C.

     cm/day

    D.

     None of these


  9. For sewers, inverted siphon is provided for

  10. A.

     One pipe

    B.

     Two pipes

    C.

     Three pipes

    D.

     Four pipes


  11. For large sewers, maximum distance between manholes may be

  12. A.

     50 m

    B.

     100 m

    C.

     200 m

    D.

     300 m


  13. In sewage, the solids in mg per litre is

  14. A.

     100 to 500

    B.

     500 to 1000

    C.

     1000 to 1500

    D.

     1500 to 2000


  15. For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

  16. A.

     H₂SO₄

    B.

     HNO₃

    C.

     HCl

    D.

     None of these


  17. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

  18. A.

     Hydrochloric acid

    B.

     Sulphuric acid

    C.

     Nitric acid

    D.

     Citric acid


  19. Pathogens (or pathogenic bacterias) in water may cause

  20. A.

     Typhoid

    B.

     Cholera

    C.

     Dysentery

    D.

     All the above