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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

None of these
1 in 60
1 in 100
1 in 120

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

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Waste Water Engineering
The sewerage system consists of

Lateral sewer
House sewer
Branch sewer
All of these

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Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

All listed here
Cholera
Dysentery
Typhoid

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Waste Water Engineering
The effluent of a septic tank is

None of these
Fit for discharge into any open drain
As good as that from a complete treatment
Foul and contains dissolved and suspended solids

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Waste Water Engineering
Water content of sewage is about

0.999
0.95
0.99
0.9

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