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Civil Engineering :: Waste Water Engineering

  1. The water carried sewerage system removes

  2. A.

     Domestic sewage

    B.

     Industrial sewage

    C.

     Storm sewage

    D.

     All the above


  3. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

  4. A.

     3 ppm

    B.

     4 ppm

    C.

     5 ppm

    D.

     10 ppm


  5. Rate of flow of sewage is generally assumed

  6. A.

     More than the rate of water supply

    B.

     Equal to the rate of water supply

    C.

     Less than the rate of water supply

    D.

     At 150 litres per capita


  7. House connections to the laterals is generally made by

  8. A.

     R.C.C.

    B.

     P.C.C.

    C.

     Cast iron

    D.

     Glazed stonewares


  9. The self-cleansing velocity of water flowing through pipe lines, is

  10. A.

     2 metres/sec

    B.

     1 metre/sec

    C.

     0.5 metre/sec

    D.

     0.25 metre/sec


  11. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

  12. A.

     Centrifugal pump

    B.

     Pneumatic ejector

    C.

     Reciprocating pump

    D.

     None of these


  13. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

  14. A.

     0.68 m

    B.

     0.88 m

    C.

     1.36 m

    D.

     1.76 m


  15. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

  16. A.

     16 m

    B.

     20 m

    C.

     24 m

    D.

     30 m


  17. If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

  18. A.

     1.15 D

    B.

     1.25 D

    C.

     1.5 D

    D.

     1.75 D


  19. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

  20. A.

     10 cm

    B.

     12 cm

    C.

     15 cm

    D.

     18 cm