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  • Question

  • To maintain aerobic biological activity, the moisture content of the compost mass should be about


  • Options
  • A. 45%
  • B. 50%
  • C. 55%
  • D. 60%.

  • Correct Answer
  • 55% 

    • Waste Water Engineering problems

    Search Results

    • 1. The sewer pipes

    • Options
    • A. carry sewage as gravity conduits
    • B. are designed for generating self-cleansing velocities at different discharge
    • C. should resist the wear and tear caused due to abrasion
    • D. all the above.
      • Discuss
    • 2. Bottom openings 15 cm x 15 cm in the standing baffle wall are provided

    • Options
    • A. 15 cm c/c
    • B. 22.5 cm c/c
    • C. 30 cm c/c
    • D. 50 cm c/c.
      • Discuss
    • 3. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

    • Options
    • A. 1.39 m
    • B. 1.49 m
    • C. 1.59 m
    • D. 1.69 m
    • E. 1.79 m.
      • Discuss
    • 4. A manhole is generally provided at each

    • Options
    • A. bend
    • B. junction
    • C. change of gradient
    • D. change of sewer diameter
    • E. all the above.
      • Discuss
    • 5. For having central angle ?, the area of cross-section of sewers running partially full, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. In very first stage of decomposition of the organic matter in sewage

    • Options
    • A. nitrites are formed
    • B. nitrates are formed
    • C. carbondioxide is formed
    • D. ammonia is formed.
      • Discuss
    • 7. The normal values of over flow rates for secondary sedimentation tanks, 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 10, 000 litres/sqm/day
    • E. none of these.
      • Discuss
    • 8. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

    • Options
    • A. 50 ppm
    • B. 100 ppm
    • C. 150 ppm
    • D. 200 ppm
    • E. 250 ppm.
      • Discuss
    • 9. The following is the physical characteristic of sewage

    • Options
    • A. turbidity
    • B. colour
    • C. odour
    • D. temperature
    • E. all the above.
      • Discuss
    • 10. Pick up the correct statement from the following :

    • Options
    • A. Maximum daily flow = 2 times the average daily flow
    • B. Maximum daily flow = x average daily flow
    • C. Sewers are designed for minimum permissible velocity at minimum flow
    • D. All the above.
      • Discuss

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