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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

None of these
1 in 60
1 in 120
1 in 100

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

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

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Waste Water Engineering
1000 kg of sewage contains

Both A and C of above
0.112 kg in solution
0.112 kg in suspension
0.225 kg in solution

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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
Drop manholes are the manholes

Without manhole covers
Having drains at different levels
With depths more than 3.5 m
Without entry ladders

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.085
1.075
1.065
1.095

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