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Waste Water Engineering

Waste Water Engineering
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

40 mm
30 mm
20 mm
50 mm

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.065
1.095
1.085
1.075

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

Organic nitrogen and ammonia
Nitrogen and organic nitrogen
All listed here
Ammonia and nitrogen

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

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

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Waste Water Engineering
Self-cleansing velocity is

Velocity of water in a pressure filter
Velocity of water at flushing
Velocity at which no accumulation remains in the drains
Velocity at dry weather flow

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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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