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Civil Engineering :: Waste Water Engineering

  1. R.M.O. expenses include

  2. A.

     Running expenses

    B.

     Maintenance expenses

    C.

     Operation expenses

    D.

     All the above


  3. 15 cumecs, the depth d and width are related by For drains up to

  4. A.

     d = 0.2 B

    B.

     d = 0.5 B

    C.

     B = 0.2 d

    D.

     B = 0.5 d


  5. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

  6. A.

     30 minutes

    B.

     1 hour

    C.

     1 hour and 30 minutes

    D.

     2 hours


  7. The discharge per unit plan area of a sedimentation tank, is generally called

  8. A.

     Over flow rate

    B.

     Surface loading

    C.

     Over flow velocity

    D.

     All the above


  9. The recommended detention period for grit chambers is

  10. A.

     1 minute

    B.

     2 minutes

    C.

     3 minutes

    D.

     5 minutes


  11. Clogging of sewers, is caused due to

  12. A.

     Silting

    B.

     Low discharge

    C.

     Greasy and oily matters

    D.

     All the above


  13. A rainfall may be classified as acidic if its pH value is less or equal to

  14. A.

     6

    B.

     7

    C.

     5

    D.

     6.5


  15. In very first stage of decomposition of the organic matter in sewage

  16. A.

     Nitrites are formed

    B.

     Nitrates are formed

    C.

     Carbondioxide is formed

    D.

     Ammonia is formed


  17. The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

  18. A.

     A heap

    B.

     Plateau

    C.

     Windrow

    D.

     None of these


  19. Flocculated particles do not change their

  20. A.

     Size

    B.

     Shape

    C.

     Weight

    D.

     None of these