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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

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

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Waste Water Engineering
In areas where rainy season is limited to a few months, the type of sewerage system recommended is

None of these
Separate system
Partially separate system
Combined system

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

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

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

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

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Waste Water Engineering
Dry weather flow is:

Average daily rate of flow
Average annual rate of flow
Average monthly rate of flow
Water supply allowance per capita

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

400 mg/l
200 mg/l
300 mg/l
100 mg/l

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