Sewage Treatment Plant objective questions and answers
16. Which operation is generally not done during preliminary treatment of sewage
A.Chlorination of sewage
B.Oil and grease removal from skimming tanks
C.Removal of grit
D.removal of sand
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A. Chlorination of sewage
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17. Lead acetate test in seewer manhole is done to test the presence of
A.Methane
B.Hydrogen sulphide
C.Carbondioxide gas
D.Diesel vapours
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18. The suitable cross-section of sewers to carry combined flow, is
A.Circular
B.Egg shaped
C.Rectangular
D.Horse shoe shaped
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19. The laying of sewers is done with
A.Magnetic compass
B.Theodolite
C.Level
D.Plane table
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20. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of cencrete is kept
A.10.0
B.5.0
C.2.0
D.0.25
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