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Civil Engineering :: Waste Water Engineering

  1. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

  2. A.

     213.5 cm/sec

    B.

     313.5 cm/sec

    C.

     413.5 cm/sec

    D.

     500 cm/sec

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  3. For evaporation and measurement of settable solids, the apparatus used, is

  4. A.

     A jar

    B.

     A breaker

    C.

     A test tube

    D.

     An Imhoff cone

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  5. As compared to fresh river water, sea water contains oxygen

  6. A.

     10% less

    B.

     20% less

    C.

     10% more

    D.

     20% more

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  7. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

  8. A.

     Full depth

    B.

     Half full

    C.

     Two third full

    D.

     Three fourth full

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  9. The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

  10. A.

     Vs = 418 (Gs – Gw) d [(3T + 70)/100]

    B.

     Vs = 418 (Gs – Gw)d² [(3T + 70)/100]

    C.

     Vs = 218 (Gs – Gw)d² [(3T + 70)/100]

    D.

     Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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  11. Sewer manholes are generally provided at

  12. A.

     The change of gradient

    B.

     The change of direction

    C.

     The junctions of sewers

    D.

     All of these

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  13. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

  14. A.

     Initial demand

    B.

     First stage demand

    C.

     Carbonaceous demand

    D.

     All of these

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  15. The asbestos cement pipes are generally laid

  16. A.

     Horizontally

    B.

     Vertically

    C.

     At an angle of 30°

    D.

     At an angle of 60°

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  17. pH value of sludge during alkaline regression stage, is

  18. A.

     More than 7

    B.

     Less than 7

    C.

     Less than 6

    D.

     More than 6

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  19. The small sewers are cleaned by

  20. A.

     Flushing

    B.

     Cane rodding

    C.

     Wooden pills

    D.

     None of these

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