- (A) Aeration is continued till stability
- (B) Aeration is done with an admixture of previously aerated sludge
- (C) Sludge is activated by constant stirring
- (D) Water is removed by centrifugal action
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- (A) d/D = ½ (1 – –
- (B) a/A
- (C) r/R = [1 –
- (D) All the above
- (A) 1.39 m
- (B) 1.49 m
- (C) 1.59 m
- (D) 1.69 m
- (A) Rivers
- (B) Seas
- (C) Lakes
- (D) None of these
- (A) Bacterias
- (B) Suspended solids
- (C) Sediments
- (D) Hardness
- (A) Inverted syphon
- (B) Depressed sewer
- (C) Sag pipe
- (D) all of these
- (A) 1.5
- (B) 2.0
- (C) 3.0
- (D) 4.0
- (A) Flow velocity 0.15 m to 0.3 m/sec is kept
- (B) Depth of 0.9 m to 1.20 m is kept
- (C) One minute of detention period is kept
- (D) All the above
- (A) Methane gas
- (B) Hydrogen sulphide
- (C) Carbondioxide gas
- (D) Diesel vapours
- (A) City
- (B) Out-fall
- (C) Tail end
- (D) Any point
