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  • Question

  • 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).

  • Correct Answer
  • concreting 

    • Waste Water Engineering problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Pick up the incorrect size of stone ware sewers

    • Options
    • A. 52.5 cm
    • B. 67.5 cm
    • C. 82.5 cm
    • D. 90 cm
    • E. none of these.
      • Discuss
    • 4. Pick up the correct statement from the following :

    • Options
    • A. the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
    • B. the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
    • C. the minimum design velocity of sewer pipes is taken as 0.8 m/sec
    • D. all the above.
      • Discuss
    • 5. The pressure exerted by

    • Options
    • A. the sewage when running full from inside, is called internal pressure
    • B. the internal pressure if any, causes tensile stress in the pipe material
    • C. pressure sewers are designed to be safe in tension
    • D. All the above.
      • Discuss
    • 6. 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
    • 7. 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
    • 8. The intensity of rain is expressed in

    • Options
    • A. cm/minute
    • B. cm/hour
    • C. cm/day
    • D. none of these.
      • Discuss
    • 9. 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
    • 10. 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

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