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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 settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]

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Waste Water Engineering
Drop manholes are the manholes

Without manhole covers
Without entry ladders
With depths more than 3.5 m
Having drains at different levels

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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
100 mg/l
300 mg/l
200 mg/l

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Waste Water Engineering
The most efficient cross section of sewers in a separate sewerage system is

New egged
Parabolic
Circular
Rectangular

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Waste Water Engineering
The most effective arrangement for diverting excess storm water into a natural drainage, is

Leaping weir
None of these
Siphon spill way
Overflow weir

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