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Civil Engineering :: Waste Water Engineering

  1. Which one of the following tests is used for testing sewer pipes?

  2. A.

     Water test

    B.

     Ball test

    C.

     Mirror test

    D.

     All of these

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  3. Pick up the correct statement from the following:

  4. A.

     The larger the sewer in size, more will be velocity

    B.

     The smaller the sewer in size, less will be velocity

    C.

     The larger the sewer in size, no deposition will take place

    D.

     The larger the sewer in size, deposition will take place

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  5. Pick up the incorrect statement from the following:

  6. A.

     The mixture of water and waste products, is called sewage

    B.

     The treated sewage effluents, are generally used for irrigating the crops

    C.

     The process of collecting, treating and disposing off the sewage, is called sewerage

    D.

     The old convergence system was definitely better than water carried sewerage system

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  7. Aerobic activity is maximum

  8. A.

     In freshly produced sewage

    B.

     At sewer pipes

    C.

     In sewer treatment plants

    D.

     None of these

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  9. During preliminary treatment of a sewage

  10. A.

     Oil and grease are removed from skimming tanks

    B.

     Floating materials are removed by screening

    C.

     Girt and sand are removed by girt chambers

    D.

     All the above

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  11. Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

  12. A.

     pt = 3H3p/2 Z5

    B.

     pt = 2H3p/3 Z5

    C.

     pt = 3H3p/2 Z5

    D.

     pt = 2H3p/3 Z5

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  13. Traps

  14. A.

     Are water seals which prevent the entry of foul gases

    B.

     Are used to trap the rats entering sewers

    C.

     Dissolve the foul gases

    D.

     Create symphonic action to increase the quick disposal of sewerage

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  15. In sewage having fully oxidised organic matter, the nitrogen exists in the form of

  16. A.

     Nitrites

    B.

     Nitrates

    C.

     Free ammonia

    D.

     Aluminoid nitrogen

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  17. In sewers the highest non-scouring velocity is achieved in

  18. A.

     Glazed bricks sewers

    B.

     Cast iron sewers

    C.

     Cement concrete sewers

    D.

     Stone ware sewers

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  19. If the pH value of sewage is 7

  20. A.

     It is acidic

    B.

     It is alkaline

    C.

     It is neutral

    D.

     None of these

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