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Waste Water Engineering

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

Dysentery
All listed here
Cholera
Typhoid

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

1 hour and 30 minutes
30 minutes
2 hours
1 hour

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Waste Water Engineering
The most effective arrangement for diverting excess storm water into a natural drainage, is

None of these
Leaping weir
Siphon spill way
Overflow weir

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.74 D
D’ = 0.84 D
D’ = 0.94 D
D’ = 0.64 D

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 + P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1
[(100 – P1)/(100 + P2)] V1
[(100 – P1)/(100 – P2)] V1

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.05552 cumec
0.05556 cumec
0.0556 cumec

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