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Waste Water Engineering

Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43833
43834
43832
43894

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

1 hour
30 minutes
1 hour and 30 minutes
2 hours

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

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

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Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

3 hours
2 hours
5 hours
4 hours

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.1 mm
Less than 0.05 mm
Greater than 0.1 mm
Less than 0.01 mm

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% less
10% less
10% more
20% more

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