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Waste Water Engineering

Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Circular
Horse shoe shaped
Rectangular
Egg shaped

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Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

25 litres/person/month
30 litres/person/year
25 litres/person/year
30 litres/person/month

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Waste Water Engineering
The temperature affects the

Viscosity of sewage
All of these
Biological activity of bacteria in sewage
Solubility of gases in sewage

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Waste Water Engineering
The minimum diameter of a sewer is kept

25 cm
10 cm
20 cm
15 cm

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Waste Water Engineering
The underground sewers are more subjected to

Tensile force
Shearing force
Compressive force
Bending force

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

2.65
2.25
2.5
2.55

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