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Civil Engineering :: Waste Water Engineering

  1. A rain sanitary sewer is constructed to carry

  2. A.

     Sanitary sewage

    B.

     Storm sewage

    C.

     Surface water

    D.

     Ground water

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  3. Primary treatment of sewage consists of removal of

  4. A.

     Large suspended organic solids

    B.

     Oil and grease

    C.

     Sand and girt

    D.

     Floating materials

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  5. For efficient working of a sewer, it must be ensured that

  6. A.

     Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

    B.

     A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

    C.

     Both (A) and (B)

    D.

     Neither (A) nor (B)

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  7. In olden days the type of section adopted in trunk and out fall sewers was

  8. A.

     Parabolic shaped

    B.

     Horse shoe shaped

    C.

     Egg shaped

    D.

     Circular shaped

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  9. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

  10. A.

     House sewer

    B.

     Lateral sewer

    C.

     Branch sewer

    D.

     Sewer outfall

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  11. Lead acetate test in sewer manhole is done to test the presence of

  12. A.

     Methane gas

    B.

     Hydrogen sulphide

    C.

     Carbondioxide gas

    D.

     Diesel vapours

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  13. The sewers

  14. A.

     Must be of adequate size to avoid over flow

    B.

     Must flow under gravity ½ to ¾ full

    C.

     Must be laid at least 2 to 3 m deep to collect /water from the basements

    D.

     All the above

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  15. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

  16. A.

     25,000 to 35,000 litres/sqm/day

    B.

     40,000 to 50,000 litres/sqm/day

    C.

     50,000 to 60,000 litres/sqm/day

    D.

     80,000 to 100,000 litres/sqm/day

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  17. The detention period for plain sedimentation water tanks, is usually

  18. A.

     4 to 8 hours

    B.

     8 to 16 hours

    C.

     16 to 24 hours

    D.

     24 to 36 hours

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  19. The minimum recommended diameter of sewers, is

  20. A.

     5 cm

    B.

     10 cm

    C.

     15 cm

    D.

     20 cm

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