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  • Question

  • 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of


  • Options
  • A. 0°C
  • B. 15°C
  • C. 20°C
  • D. 25°C.

  • Correct Answer
  • 20°C 

    • Waste Water Engineering problems

    Search Results

    • 1. If the diameter of a sewer is 150 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
    • 2. Which one of the following gases is most significant as air pollutant

    • Options
    • A. Carbondioxide
    • B. Oxygen
    • C. Nitrogen
    • D. Sulphurdioxide.
      • Discuss
    • 3. Which one of the following part of human body withstands minimum radiation

    • Options
    • A. thyroid
    • B. kidneys
    • C. eyes
    • D. ovaries/testis.
      • Discuss
    • 4. The sewer which resists sulphide corrosion, is

    • Options
    • A. Brick sewer
    • B. Cast iron sewer
    • C. R.C.C. sewer
    • D. Lead sewer
    • E. None of these.
      • Discuss
    • 5. For the open drain (N = 0.025) shown in the below figure, the discharge is

    • Options
    • A. 26.88 cumecs
    • B. 27.88 cumecs
    • C. 28.88 cumecs
    • D. 29.88 cumecs.
      • Discuss
    • 6. Which one of the following statements regarding septic tanks is wrong :

    • Options
    • A. a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
    • B. the outlet invert level is kept 5 to 7.5 cm below the inlet invert level
    • C. the minimum width of septic level is 90 cm
    • D. the depth of tank is kept equal to its width.
      • Discuss
    • 7. Design period of 40 to 50 years is adopted for

    • Options
    • A. branch sewers
    • B. main sewers
    • C. trunk sewers
    • D. all the above.
      • Discuss
    • 8. The most widely used pump for lifting sewage is

    • Options
    • A. centrifugal pump
    • B. reciprocating pump
    • C. pneumatic ejector
    • D. air pressure pump.
      • Discuss
    • 9. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

    • Options
    • A. 20 m
    • B. 30 m
    • C. 45 m
    • D. 75 m.
      • Discuss
    • 10. The sludge does not contain waste water from

    • Options
    • A. bath rooms
    • B. wash basins
    • C. kitchen sinks
    • D. toilets.
      • Discuss

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