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Waste Water Engineering

Waste Water Engineering
Flocculated particles do not change their

Size
None of these
Shape
Weight

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Aerobic bacteria
None of these
Anaerobic bacteria
Both types of bacterias

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Waste Water Engineering
The sewer pipe which carries sewage from a building for immediate disposal is

Lateral sewer
Main sewer
Intercepting sewer
House sewer

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

H₂SO₄
HCl
HNO₃
None of these

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Waste Water Engineering
Imhoff cone is used to measure

Total solids
Settleable solids
Total in organic solids
Total organic solids

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d² (0.011d + 0.785H)/Q
d (0.285d + 0.011H)/Q
d (0.785d + 0.011H)/Q
d (0.022d + 0.085H)/Q

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