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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

5
2
0.25
10

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Flow velocity 0.15 m to 0.3 m/sec is kept
One minute of detention period is kept
Depth of 0.9 m to 1.20 m is kept
All of these

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

4
1.5
2
3

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Phenol-di -sulphuric acid and potassium hydroxide
Sulphuric acid and napthamine
Potassium permanganate
None of these

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

30 days
10 days
20 days
60 days

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Waste Water Engineering
The minimum recommended diameter of sewers, is

5 cm
20 cm
15 cm
10 cm

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