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  • Question

  • In a sludge tank, the gas mainly produced, is


  • Options
  • A. Oxygen
  • B. Nitrogen
  • C. Hydrogen
  • D. Carbon dioxide
  • E. Methane.

  • Correct Answer
  • Methane. 

    • Waste Water Engineering problems

    Search Results

    • 1. The most efficient cross-section of sewers in a combined sewerage system is

    • Options
    • A. parabolic
    • B. circular
    • C. rectangular
    • D. new egged.
      • Discuss
    • 2. The disintegrating pump in which solid matter is broken up before passing out, is

    • Options
    • A. centrifugal pump
    • B. reciprocating pump
    • C. pneumatic ejector
    • D. none of these.
      • Discuss
    • 3. 1000 kg of sewage contains

    • Options
    • A. 0.112 kg in suspension
    • B. 0.112 kg in solution
    • C. 0.225 kg in solution
    • D. 0.450 kg in suspension
    • E. both (a) and (c) of above.
      • Discuss
    • 4. The value of Chezy's constant

      is used in

    • Options
    • A. Chezy's formula
    • B. Bazin's formula
    • C. Kutter's formula
    • D. Manning's formula.
      • Discuss
    • 5. For detecting the nitrates in sewage, the colour may be developed by adding

    • Options
    • A. Pottassium permanganate
    • B. Sulphuric acid and napthamine
    • C. Phenol-di-sulphuric acid and pottassium hydroxide
    • D. None of these.
      • Discuss
    • 6. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

    • Options
    • A. imhoff tanks
    • B. trickling filters
    • C. sludge sedimentation tanks
    • D. none of these.
      • Discuss
    • 7. The normal values of over flow rates for sedimentation tanks using coagulent, ranges between

    • Options
    • A. 25, 000 to 35, 000 litres/sqm/day
    • B. 40, 000 to 50, 000 litres/sqm/day
    • C. 50, 000 to 60, 000 litres/sqm/day
    • D. 80, 000 to 100, 000 litres/sqm/day
    • E. none of these.
      • Discuss
    • 8. To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is

    • Options
    • A. 0.107 L
    • B. 0.207 L
    • C. 0.307 L
    • D. 0.407 L
      • Discuss
    • 9. The depth of the centre of gravity (y) of the resultant compressive stress from the compression edge of the T-beam specified in Q. 13.52 is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than

    • Options
    • A. 4 mm
    • B. 5 mm
    • C. 6 mm
    • D. 8 mm
    • E. 10 mm
      • Discuss

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