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Waste Water Engineering

Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

10
5
0.25
2

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

None of these
HCl
HNO₃
H₂SO₄

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Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

50 m to 100 m
150 m to 300 m
100 m to 150 m
25 to 50 m

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Both silting and scouring occur at the bottom
The bottom is scoured
The bottom is silted
Neither silting nor scouring occurs at the bottom

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Waste Water Engineering
The design period in years for pumping plants, is

5 to 10
1
3 to 5
2 to 3

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

16 to 24 hours
8 to 16 hours
24 to 36 hours
4 to 8 hours

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