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  • Question

  • In normal conditions, the period for sludge digestion, is


  • Options
  • A. 10 days
  • B. 20 days
  • C. 30 days
  • D. 60 days
  • E. 90 days.

  • Correct Answer
  • 30 days 

    • Waste Water Engineering problems

    Search Results

    • 1. For drainage pipes in buildings the test applied before putting them to use, is

    • Options
    • A. water test
    • B. smoke test
    • C. straightness test
    • D. all the above.
      • Discuss
    • 2. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

    • Options
    • A. 1 in 5
    • B. 1 in 10
    • C. 1 in 15
    • D. 1 in 20
    • E. 1 in 25
      • Discuss
    • 3. Pick up the correct statement from the following :

    • Options
    • A. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
    • B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
    • C. Solubility of oxygen in sewage is 95% of that of distilled water
    • D. Dissolved oxygen content of sewage, may be determined by Winkler's method
    • E. All the above.
      • Discuss
    • 4. The underground sewers are more subjected to

    • Options
    • A. tensile force
    • B. compressive force
    • C. bending force
    • D. shearing force.
      • Discuss
    • 5. 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
    • 6. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

    • Options
    • A. 1.5
    • B. 2.0
    • C. 3.0
    • D. 4.0
      • Discuss
    • 7. For efficient working of a sewer, it must be ensured that

    • Options
    • A. minimum velocity of 0.45 m/sec, is maintained at its minimum flow
    • B. a maximum velocity of 0.90 m/sec, is maintained at its maximum flow
    • C. both (a) and (b)
    • D. neither (a) nor (b).
      • Discuss
    • 8. Pick up the correct statement from the following :

    • Options
    • A. Rate of digestion of slugde is more at higher temperature
    • B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
    • C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
    • D. 90% of digestion takes place in 30 days at 29°C, the optimum mesophilic temperature
    • E. All the above.
      • Discuss
    • 9. In Chezy's formula V = C rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is

    • Options
    • A. D
    • B.
    • C.
    • D.
    • E.
      • Discuss
    • 10. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is

    • Options
    • A. centrifugal pump
    • B. pneumatic ejector
    • C. reciprocating pump
    • D. none of these.
      • Discuss

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