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Civil Engineering :: Waste Water Engineering

  1. The screens are fixed

  2. A.

     Perpendicular to the direction of flow

    B.

     Parallel to the direction of flow

    C.

     At an angle 30° to 60° to the direction of flow

    D.

     None of these

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  3. In case of sewer lines

  4. A.

     Water test is carried out to check water tightness of the joints

    B.

     Test for straightness is carried out with the help of a lamp and mirror

    C.

     Obstruction test is carried out with the help of smooth ball of diameter 13 mm

    D.

     All the above

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  5. The pH value of fresh sewage is usually

  6. A.

     Equal to 7

    B.

     More than 7

    C.

     Less than 7

    D.

     Equal to zero

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  7. If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is

  8. A.

     1.250 D

    B.

     1.350 D

    C.

     1.425 D

    D.

     1.625 D

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  9. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

  10. A.

     1 in 60

    B.

     1 in 100

    C.

     1 in 120

    D.

     None of these

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  11. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

  12. A.

     1 in 60

    B.

     1 in 100

    C.

     1 in 120

    D.

     None of these

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  13. Pick up the incorrect size of stone ware sewers

  14. A.

     52.5 cm

    B.

     67.5 cm

    C.

     82.5 cm

    D.

     None of these

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  15. The stone ware sewers

  16. A.

     Are used for carrying sewage and drainage from houses

    B.

     Are manufactured from clays and shale

    C.

     After casting are dried and burnt at temperature 150°C, 700°C and 1200°C

    D.

     All the above

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  17. Pick up the correct statement from the following:

  18. A.

     The materials separated by screens, is called screenings

    B.

     The screenings are disposed off either by burning or by burial or by dumping

    C.

     The process of burning the screenings, is known as compositing

    D.

     All the above

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  19. Pick up the correct statement from the following:

  20. A.

     The maximum rate of storm runoff is called peak drainage discharge

    B.

     Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares

    C.

     The period after which the entire area starts contributing to the runoff, is called the time of concentration

    D.

     All the above

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