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Waste Water Engineering problems

  • 1. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

  • Options
  • A. 100 cm
  • B. 120 cm
  • C. 140 cm
  • D. 160 cm
  • E. 180 cm.
    • Discuss
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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
  • 6. The intensity of rain is expressed in

  • Options
  • A. cm/minute
  • B. cm/hour
  • C. cm/day
  • D. none of these.
    • Discuss
  • 7. 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.
    • Discuss
  • 8. The formula Civil Engineering Waste Water Engineering: The formula used for d 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
  • 9. The most efficient cross section of sewers in a separate sewerage system is

  • Options
  • A. parabolic
  • B. circular
  • C. rectangular
  • D. new egged.
    • Discuss
  • 10. 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

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