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Waste Water Engineering

Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

3 ppm
5 ppm
4 ppm
10 ppm

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
The small sewers are cleaned by

Wooden pills
None of these
Cane rodding
Flushing

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Two sewer lines intersect
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer
Ordinary manhole cannot be built

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Waste Water Engineering
The self-cleansing velocity of water flowing through pipe lines, is

1 metre/sec
0.5 metre/sec
2 metres/sec
0.25 metre/sec

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

5 kg to 7.5 kg
1 kg to 2.0 kg
7.5 kg to 10 kg
0.5 to 1.0 kg

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