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  • Question

  • Nitrogen cycle of sewage, is


  • Options
  • A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
  • B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
  • C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
  • D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
  • E. None of these.

  • Correct Answer
  • Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen 

    • Waste Water Engineering problems

    Search Results

    • 1. A drop manhole is provided if

    • Options
    • A. a sewer drops from a height
    • B. a branch sewer joins the main sewer at higher level
    • C. a lamp is inserted to check obstruction
    • D. none of these.
      • Discuss
    • 2. During preliminary treatment of a sewage

    • Options
    • 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.
      • Discuss
    • 3. The clarigesters are

    • Options
    • 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.
      • Discuss
    • 4. The presence of free ammonia in sewage, is detected by

    • Options
    • A. boiling
    • B. adding pottassium permanganate
    • C. adding sulphuric acid
    • D. phenol-di-sulphuric acid.
      • Discuss
    • 5. Pick up the correct statement from the following :

    • Options
    • 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.
      • Discuss
    • 6. The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is

    • Options
    • A. 0.10 cumec
    • B. 0.12 cumec
    • C. 0.15 cumec
    • D. 0.20 cumec.
      • Discuss
    • 7. The recommended detention period for grit chambers is

    • Options
    • A. 1 minute
    • B. 2 minutes
    • C. 3 minutes
    • D. 5 minutes.
      • Discuss
    • 8. The most dangerous pollutant in vehicular emissions is

    • Options
    • A. CO
    • B. SO2
    • C. CO2
    • D. O3.
      • Discuss
    • 9. The gradient of sewers depends upon

    • Options
    • A. velocity of flow
    • B. diameter of the sewer
    • C. discharge
    • D. all the above.
      • Discuss
    • 10. For design purposes, the normal rate of infiltration of ground water into the sewer, is

    • Options
    • A. 500 litres/km/cm
    • B. 1000 litres/km/cm
    • C. 1500 litres/km/cm
    • D. 2000 litres/km/cm
    • E. 2500 litres/km/cm.
      • Discuss

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