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Civil Engineering :: Waste Water Engineering

  1. Fresh sewage is generally

  2. A.

     Alkaline

    B.

     Acidic

    C.

     Highly decomposed

    D.

     A source of objectionable odour


  3. The sewage is pumped up

  4. A.

     From low lying areas

    B.

     From flat areas

    C.

     From basements

    D.

     All the above


  5. The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

  6. A.

     204 cu.m

    B.

     208 cu.m

    C.

     212 cu.m

    D.

     216 cu.m


  7. Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

  8. A.

     15 cm c/c

    B.

     22.5 cm c/c

    C.

     30 cm c/c

    D.

     50 cm c/c


  9. Ventilating shafts are provided to a sewer line at every

  10. A.

     100 m

    B.

     150 m

    C.

     200 m

    D.

     300 m


  11. The gradient of sewers depends upon

  12. A.

     Velocity of flow

    B.

     Diameter of the sewer

    C.

     Discharge

    D.

     All the above


  13. The laying of sewers is done with

  14. A.

     Magnetic compass

    B.

     Theodolite

    C.

     Level

    D.

     Clinometer


  15. Pick up the correct statement from the following:

  16. A.

     The boning rod is used for checking the levels of the sewer inverts

    B.

     Manhole covers are made circular for the convenience of the cleaning staff

    C.

     A manhole is classified as shallow manhole if its depth is less than 0.9 m

    D.

     All the above


  17. Pick up the correct statement from the following:

  18. A.

     The circular section of sewers provides maximum hydraulic mean depth

    B.

     The circular sewers are provided for separate sewerage system

    C.

     The circular sewers work efficiently if the sections run at least half full

    D.

     All the above


  19. The sewer which received discharge from two or more main sewers, is known as

  20. A.

     A trunk sewer

    B.

     An outfall sewer

    C.

     A main sewer

    D.

     An intercepting sewer