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  • Question
  • Pick up the correct statement from the following :


  • Options
  • A. Small sewers are cleaned by flushing
  • B. Medium sewers are cleaned by cane rodding
  • C. Medium sewers may be cleaned by pills
  • D. Large sewers are cleaned by removing the deposited materials
  • E. All the above.

  • Correct Answer
  • All the above. 


  • Waste Water Engineering problems


    Search Results


    • 1. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

    • Options
    • A. house sewer
    • B. lateral sewer
    • C. branch sewer
    • D. sewer outfall.
    • Discuss
    • 2. The asbestos cement sewers are

    • Options
    • A. light in weight
    • B. not structurally strong to bear large compressive stress
    • C. susceptible to corrosion by sulphuric acid
    • D. All the above.
    • Discuss
    • 3. The normal value of over flow rates for plain primary 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 100, 000 litres/sqm/day
    • E. none of these.
    • Discuss
    • 4. Setting out the alignments of sewers may start from

    • Options
    • A. city
    • B. out-fall
    • C. tail end
    • D. any point.
    • Discuss
    • 5. In a trickling filter

    • Options
    • A. filtration process is used
    • B. biological action is used
    • C. neither (a) nor (b)
    • D. both (a) and (b).
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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