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Waste Water Engineering

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

1.095
1.085
1.075
1.065

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Waste Water Engineering
The maximum diameter of sewers adopted in the designs is

4.0 m
1.0 m
2.0 m
3.0 m

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
200 ppm
50 ppm
100 ppm

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Dissolved oxygen in water
Hydrology
All listed here
Temperature

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Waste Water Engineering
In sewers designed with self cleansing velocity,

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

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Waste Water Engineering
A rain sanitary sewer is constructed to carry

Sanitary sewage
Ground water
Surface water
Storm sewage

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