Sewage Treatment Plant objective questions and answers

21. The asbestos cement pipes are generally laid

   A.Horizontally

   B.Vertically

   C.At an angle of 30⁰

   D.At anangle of 60 ⁰

22. The grit and silt of the grit chambers may not be used for

   A.raising low lying areas by dumping

   B.concreting

   C.both (a) and (b)

   D.neither (a) nor (b)

23. To test chemical oxygendemand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

   A.Hydrochrolic acid

   B.Sulphuric acid

   C.Nitric acid

   D.Citric acid

24. Grit is composed moistly of

   A.Grease

   B.Sand

   C.Wood

   D.Paper

25. The first stage of natural process of sludge digestion is

   A.Oxidation

   B.Acid fermentation

   C.Alkaline fermentation

   D.Acid regression

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