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Waste Water Engineering

Waste Water Engineering
The standard B.O.D. of water is taken for

2 days
3 days
1 day
5 days

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

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

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Waste Water Engineering
The factor responsible for purification of sewage in river is

All listed here
Hydrology
Dissolved oxygen in water
Temperature

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

4.5 to 5.5 m/sec
3.0 to 4.0 m/sec
3.5 to 4.5 m/sec
2.5 to 3.0 m/sec

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Rivers
Lakes
None of these
Seas

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

HCl
None of these
H₂SO₄
HNO₃

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