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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

Ammonia
Carbon dioxide
All listed here
Hydrogen

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Waste Water Engineering
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

216 cu.m
212 cu.m
204 cu.m
208 cu.m

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Waste Water Engineering
In areas where rainy season is limited to a few months, the type of sewerage system recommended is

Combined system
Partially separate system
None of these
Separate system

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Waste Water Engineering
The asbestos cement pipes are generally laid

At an angle of 30°
At an angle of 60°
Vertically
Horizontally

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

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

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

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