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Civil Engineering :: Waste Water Engineering

  1. The sewer pipe which carries sewage from a building for immediate disposal is

  2. A.

     House sewer

    B.

     Lateral sewer

    C.

     Intercepting sewer

    D.

     Main sewer


  3. For a continuous flow type of sedimentation tanks

  4. A.

     Width of the tank is normally kept about 6 m

    B.

     Length of the tank is normally kept 4 to 5 times the width

    C.

     Maximum horizontal flow velocity is limited to 0.3 m/minute

    D.

     All the above


  5. The use of coarse screens for the disposal of sewage, may be dispensed with by

  6. A.

     Comminutor

    B.

     Shredder

    C.

     Both A and B

    D.

     Neither A nor B


  7. In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

  8. A.

     100 mm dia

    B.

     150 mm dia

    C.

     225 mm dia

    D.

     All of these


  9. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

  10. A.

     1.5

    B.

     2.0

    C.

     2.5

    D.

     3.0


  11. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

  12. A.

     1.5

    B.

     2.0

    C.

     2.5

    D.

     3.0


  13. Pick up the correct statement from the following:

  14. A.

     Indore method of composting involves decomposition under aerobic conditions

    B.

     Bangalore method of composting involves decomposing under anaerobic conditions

    C.

     Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

    D.

     all of these


  15. Pick up the correct statement from the following:

  16. A.

     Inlets are provided on the road surface at the lowest point for draining rain water

    B.

     Inlets are generally provided at an interval of 30 m to 60 m along straight roads

    C.

     Inlets having horizontal openings, are called horizontal inlets

    D.

     All the above


  17. The disintegrating pump in which solid matter is broken up before passing out, is

  18. A.

     Centrifugal pump

    B.

     Reciprocating pump

    C.

     Pneumatic ejector

    D.

     None of these


  19. Hume steel pipes are

  20. A.

     Steel pipes

    B.

     Steel shell coated from inside with cement mortar

    C.

     Steel shell coated from outside with cement mortar

    D.

     Both B and C