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Waste Water Engineering problems

  • 1. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

  • Options
  • A. is only provided
  • B. is doubled
  • C. is trebled
  • D. is not enough.
    • Discuss
  • 2. Imhoff cone is used to measure

  • Options
  • A. total organic solids
  • B. total solids
  • C. total in organic solids
  • D. settleable solids.
    • Discuss
  • 3. If q is the average sewage flow from a city of population P, the maximum sewage flow

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 4. The rainfall at any place may be determined by

  • Options
  • A. its intensity
  • B. its direction
  • C. its frequency
  • D. all the above.
    • Discuss
  • 5. PH value of sludge during alkaline regression stage, is

  • Options
  • A. more than 7
  • B. less than 7
  • C. less than 6
  • D. more than 6.
    • Discuss
  • 6. The average temperature of sewage in India, is

  • Options
  • A. 10°C
  • B. 15°C
  • C. 20°C
  • D. 25°C
  • E. 30°C.
    • Discuss
  • 7. The first stage of neutral process of sludge digestion, is

  • Options
  • A. acid fermentation
  • B. acid regression
  • C. alkaline fermentation
  • D. none of these.
    • Discuss
  • 8. The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

  • Options
  • A. 25%
  • B. 50%
  • C. 10%
  • D. 5%.
    • Discuss
  • 9. The use of coarse screens for the disposal of sewage, may be dispensed with by

  • Options
  • A. comminutor
  • B. shredder
  • C. both (a) and (b)
  • D. neither (a) nor (b).
    • Discuss
  • 10. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is

  • Options
  • A.
  • B.
  • C.
  • D. ?D.
    • Discuss

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