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Civil Engineering :: Waste Water Engineering

  1. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

  2. A.

     1.5

    B.

     2.0

    C.

     3.0

    D.

     4.0


  3. Lead caulked joints are used for laying

  4. A.

     Stone ware pipes

    B.

     Earthenware pipes

    C.

     C.I. pipes

    D.

     G.I. pipes


  5. Large diameter sewers subjected to external pressure alone, are reinforced

  6. A.

     Near the inner surface of the pipe

    B.

     Near the outer surface of the pipe

    C.

     Both A and B

    D.

     With elliptical cage


  7. The presence of free ammonia in sewage, is detected by

  8. A.

     Boiling

    B.

     Adding potassium permanganate

    C.

     Adding sulphuric acid

    D.

     Phenol-di-sulphuric acid


  9. The rational formula for peak drainage discharge, was evolved by

  10. A.

     Fruhling

    B.

     Lloyd David

    C.

     Kuichling

    D.

     All of these


  11. In sewers designed with self cleansing velocity,

  12. A.

     The bottom is silted

    B.

     The bottom is scoured

    C.

     Both silting and scouring occur at the bottom

    D.

     Neither silting nor scouring occurs at the bottom


  13. The sewer that unloads the sewage at the point of treatment is called

  14. A.

     Main sewer

    B.

     Outfall sewer

    C.

     Branch sewer

    D.

     House sewer


  15. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

  16. A.

     2.25

    B.

     2.50

    C.

     2.55

    D.

     2.65


  17. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

  18. A.

     Unexpected large scale infiltration of stream water

    B.

     Unexpected increase in the population

    C.

     Under estimates of maximum and average flows

    D.

     All of the above


  19. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

  20. A.

     2.30 m

    B.

     2.40 m

    C.

     2.45 m

    D.

     2.50 m