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Waste Water Engineering

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

5 days
3 days
1 day
2 days

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Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.50 m
2.30 m
2.45 m
2.40 m

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Oxygen
Hydrogen sulphide
Carbon dioxide
Methane

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Waste Water Engineering
Flocculated particles do not change their

Shape
None of these
Weight
Size

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Waste Water Engineering
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

1.2 m
0.9 cm
> 1.5 m
1.5 m

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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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