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Waste Water Engineering

Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

40 cm
20 cm
25 cm
50 cm

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

80,000 to 100,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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

Egg shaped
Circular shaped
Parabolic shaped
Horse shoe shaped

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Waste Water Engineering
The temperature affects the

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

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Waste Water Engineering
In SI units the power of sound is represented in

Newtons
Watts
Joules
Kgs

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

18 cm
10 cm
15 cm
12 cm

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