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Civil Engineering :: Waste Water Engineering

  1. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

  2. A.

     100 mg/l

    B.

     200 mg/l

    C.

     300 mg/l

    D.

     400 mg/l

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  3. 1000 kg of sewage contains

  4. A.

     0.112 kg in suspension

    B.

     0.112 kg in solution

    C.

     0.225 kg in solution

    D.

     Both A and C of above

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  5. Water content of sewage is about

  6. A.

     90 %

    B.

     95 %

    C.

     99 %

    D.

     99.9 %

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  7. A circular sewer section is preferred to because

  8. A.

     It is cheaper in construction

    B.

     It provides maximum area for a given perimeter

    C.

     It provides maximum hydraulic mean depth

    D.

     All the above

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  9. The ratio of minimum hourly flow to the average flow of sewage is

  10. A.

     1/4

    B.

     1/3

    C.

     1/2

    D.

     3/4

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  11. In a fully mechanised composting plant, involves

  12. A.

     Mechanized receipt

    B.

     Mechanized segregation

    C.

     Mechanized pulverising of refuse

    D.

     All of these

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  13. For drainage pipes in buildings the test applied before putting them to use, is

  14. A.

     Water test

    B.

     Smoke test

    C.

     Straightness test

    D.

     All the above

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  15. During purification process of sewage the gas given off, is

  16. A.

     Carbon dioxide

    B.

     Hydrogen

    C.

     Ammonia

    D.

     All the above

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  17. Antisyphonage pipe is fitted

  18. A.

     At the end of septic tanks

    B.

     On manholes

    C.

     With a W.'trap

    D.

     At the beginning of sewer line

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  19. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

  20. A.

     d² (0.011d + 0.785H)/Q

    B.

     d (0.022d + 0.085H)/Q

    C.

     d (0.785d + 0.011H)/Q

    D.

     d (0.285d + 0.011H)/Q

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