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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

1.075
1.095
1.085
1.065

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Waste Water Engineering
To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.5
0.55
0.45
0.6

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
Oxidation process results in the formation of

All of these
Sulphates
Carbon dioxide
Nitrates

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Waste Water Engineering
The standard B.O.D. of water is taken for

3 days
5 days
1 day
2 days

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Waste Water Engineering
If the pH value of sewage is 7

It is acidic
It is alkaline
None of these
It is neutral

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