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Waste Water Engineering

Waste Water Engineering
The underground sewers are more subjected to

Compressive force
Shearing force
Tensile force
Bending force

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

100 ppm
150 ppm
50 ppm
200 ppm

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Invert level of a branch sewer is more than 60 cm that of the main sewer
Ordinary manhole cannot be built
Two sewer lines intersect
Sewer line runs along a main road

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Waste Water Engineering
Discrete or granular particles change their

Size
None of these
Weight
Shape

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D2/3 = 4 b2/3
D3/8 = 4 b3/8
D3/2 = 4 b3/2
D8/3 = 4 b8/3

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