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Waste Water Engineering

Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Egg shaped
Horse shoe shaped
Circular shaped
Parabolic shaped

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/3
D/4
D/2
D/1

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Waste Water Engineering
The laying of sewers is done with

Magnetic compass
Theodolite
Clinometer
Level

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25
2.65
2.55
2.5

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Waste Water Engineering
Primary treatment of sewage consists of removal of

Large suspended organic solids
Floating materials
Oil and grease
Sand and girt

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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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