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Waste Water Engineering

Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Screening
Sedimentation
Oxidation
All listed here

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Waste Water Engineering
depends upon The Chezy’s constant C in the formula V = C

Shape of the sewer
Roughness of sewer surface
All listed here
Size of the sewer

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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
1 in 120
None of these
1 in 100

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Bio-Chemical Oxygen Demand (B.O.D.)
Chemical Oxygen Demand (C.O.D.)
None of these
Dissolved Oxygen (D.O.)

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Waste Water Engineering
For trunk and out-fall, the type of sewers generally used, is

Standard egg shaped
Horse shoe shaped
Circular shaped
Parabolic shaped

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Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

Size and shape of solid
Velocity of flow
All listed here
Viscosity of water

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