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Waste Water Engineering

Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

5
2
0.25
10

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Waste Water Engineering
The sludge does not contain waste water from

Bath rooms
Toilets
Wash basins
Kitchen sinks

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

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

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Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

200 ppm
250 ppm
225 ppm
None of these

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Waste Water Engineering
Sewer pipes need be checked for

Maximum flow
None of these
Both A and B
Minimum flow

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Kutter
Crimp and Bruges
William-Hazen
Bazin

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