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Waste Water Engineering

Waste Water Engineering
The rational formula for peak drainage discharge, was evolved by

All of these
Fruhling
Kuichling
Lloyd David

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Two sewer lines intersect
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer

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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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Waste Water Engineering
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

1095 mm
1065 mm
1075 mm
1045 mm

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

90 cm
80 cm
50 cm
100 cm

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Sulphuric acid and napthamine
None of these
Phenol-di -sulphuric acid and potassium hydroxide
Potassium permanganate

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