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  • Question

  • If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of


  • Options
  • A. degradation
  • B. active decomposition
  • C. recovery
  • D. cleaner water
  • E. none of these.

  • Correct Answer
  • active decomposition 

    • Waste Water Engineering problems

    Search Results

    • 1. In 1000 kg of sewage, the total solids approximate

    • Options
    • A. 0.5 to 1.0 kg
    • B. 1 kg to 2.0 kg
    • C. 5 kg to 7.5 kg
    • D. 7.5 kg to 10 kg.
      • Discuss
    • 2. Dry weather flow is :

    • Options
    • A. average daily rate of flow
    • B. average monthly rate of flow
    • C. average annual rate of flow
    • D. water supply allowance per capita
    • E. none of these.
      • Discuss
    • 3. Which one of the following resists hydrogen sulphide corrosion

    • Options
    • A. R.C.C.
    • B. Glazed stone wares
    • C. Asbestos cement
    • D. Glazed ware.
      • Discuss
    • 4. As compared to fresh river water, sea water contains oxygen

    • Options
    • A. 10% less
    • B. 20% less
    • C. 10% more
    • D. 20% more.
      • Discuss
    • 5. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

    • Options
    • A. 1 in 60
    • B. 1 in 100
    • C. 1 in 120
    • D. none of these.
      • Discuss
    • 6. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

    • Options
    • A. 213.5 cm/sec
    • B. 313.5 cm/sec
    • C. 413.5 cm/sec
    • D. 500 cm/sec.
      • Discuss
    • 8. In sewers designed with self cleansing velocity,

    • Options
    • A. the bottom is silted
    • B. the bottom is scoured
    • C. both silting and scouring occur at the bottom
    • D. neither silting nor scouring occurs at the bottom.
      • Discuss
    • 9. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. Hume steel pipes are

    • Options
    • A. steel pipes
    • B. R.C.C. pipes
    • C. steel shell coated from inside with cement mortar
    • D. steel shell coated from outside with cement mortar
    • E. both (c) and (d).
      • Discuss

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