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Waste Water Engineering

Waste Water Engineering
Clogging of sewers, is caused due to

All of these
Low discharge
Silting
Greasy and oily matters

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

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

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in suspension
Both A and C of above
0.225 kg in solution
0.112 kg in solution

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Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Dysentery
Typhoid
All listed here
Cholera

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Waste Water Engineering
In sewage, the solids in mg per litre is

1500 to 2000
1000 to 1500
500 to 1000
100 to 500

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Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.69 m
1.49 m
1.39 m
1.59 m

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