Sewage Treatment Plant objective questions and answers

21. The grit chamber of a sewage plant is usually cleaned after

   A.12 to 24 hours

   B.5 days

   C.One week

   D.Two weeks.

22. Rate of flow sewage is generally assumed

   A.More than the rate of water supply

   B.Equal to the rate of water supply

   C.Less than the rate of water supply

   D.At 150 litres per capita

23. The coagulant widely used for sewage treatmenT, is

   A.Alum

   B.Ferric chloride

   C.Ferricsulphate

   D.Chlorinated coppers

24. The bottom of the sewage inlet chamber of septic tanks, provided an outward slope

   A.1 in 5

   B.1 in 10

   C.1 in 15

   D.1 in 20

25. The coagulant which is generally not used for treating the sewage, is

   A.Alum

   B.Ferric chloride

   C.Ferric sulphate

   D.Chlorinated copper

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