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  • Question

  • The rate of accumulation of sludge per person per year, is


  • Options
  • A. 10 litres
  • B. 15 litres
  • C. 20 litres
  • D. 25 litres
  • E. 30 litres.

  • Correct Answer
  • 20 litres 

    • Waste Water Engineering problems

    Search Results

    • 1. The intensity of rain is expressed in

    • Options
    • A. cm/minute
    • B. cm/hour
    • C. cm/day
    • D. none of these.
      • Discuss
    • 2. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is

    • Options
    • A. separate system
    • B. combined system
    • C. partially combined system
    • D. none of these.
      • Discuss
    • 3. The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. The grit and silt of the grit chambers, may not be used for

    • Options
    • A. raising low lying areas by dumping
    • B. concreting
    • C. both (a) and (b)
    • D. neither (a) nor (b).
      • Discuss
    • 5. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

    • Options
    • A. 0.9 cm
    • B. 1.2 m
    • C. 1.5 m
    • D. > 1.5 m.
      • Discuss
    • 6. The formula used for determining flow velocities in sewers, is known as

    • Options
    • A. Chezy's formula
    • B. Bazin's formula
    • C. Kutter's formula
    • D. Manning's formula.
      • Discuss
    • 7. The most efficient cross section of sewers in a separate sewerage system is

    • Options
    • A. parabolic
    • B. circular
    • C. rectangular
    • D. new egged.
      • Discuss
    • 8. If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

    • Options
    • A. 100 mg/l
    • B. 200 mg/l
    • C. 300 mg/l
    • D. 400 mg/l.
      • Discuss
    • 9. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by

    • Options
    • A. Bazin
    • B. Crimp and Bruge
    • C. William-Hazen
    • D. Kutter.
      • Discuss
    • 10. Pick up the incorrect statement from the following for allowing workers to enter sewers

    • Options
    • A. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
    • B. Proper tests for the presence of poisonous gases must be carried out
    • C. The men entering the manhole should be advised to smoke in the sewer
    • D. Warning signals should be erected
    • E. None of these.
      • Discuss

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