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Civil Engineering :: Waste Water Engineering

  1. The effluent of a septic tank is

  2. A.

     Fit for discharge into any open drain

    B.

     Foul and contains dissolved and suspended solids

    C.

     As good as that from a complete treatment

    D.

     None of these

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  3. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

  4. A.

     0°C

    B.

     15°C

    C.

     20°C

    D.

     25°C

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  5. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

  6. A.

     1 in 5

    B.

     1 in 10

    C.

     1 in 15

    D.

     1 in 20

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  7. Drop manholes are the manholes

  8. A.

     Without entry ladders

    B.

     Without manhole covers

    C.

     With depths more than 3.5 m

    D.

     Having drains at different levels

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  9. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

  10. A.

     100 cm

    B.

     120 cm

    C.

     140 cm

    D.

     160 cm

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  11. The rainfall at any place may be determined by

  12. A.

     Its intensity

    B.

     Its direction

    C.

     Its frequency

    D.

     All the above

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  13. The clarigesters are

  14. A.

     Circular septic tanks

    B.

     Rectangular septic tanks

    C.

     Circular Imhoff double tanks with bottom hoppers

    D.

     Circular Imhoff double storey tanks without bottom hoppers

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  15. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

  16. A.

     Manually

    B.

     Mechanically

    C.

     Hydraulically

    D.

     Electrically

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  17. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

  18. A.

     10.0

    B.

     5.0

    C.

     2.0

    D.

     0.25

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  19. A manhole is classified as shallow if its depth is between

  20. A.

     0.4 to 0.5 m

    B.

     0.5 to 0.7 m

    C.

     0.7 to 0.9 m

    D.

     0.9 to 1.20 m

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