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Environmental Engineering

Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Detritus tanks
Sedimentation tanks
Grit chambers
Skimming tanks

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Environmental Engineering
The most common cause of acidity in water is

Nitrogen
Carbon dioxide
Hydrogen
Oxygen

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD
COD > BOD > TOD
TOD > COD > BOD
TOD > BOD > COD

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Environmental Engineering
Residual chlorine in water is determined by

Orthotolidine method
None of these
Both (A) and (B)
Starch iodide method

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Environmental Engineering
The maximum discharge of a tube well is about

500 liters/sec
50 liters/sec
5 liters/sec
1000 liters/sec

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Environmental Engineering
The detention period for oxidation ponds is usually kept as

3 months
10 to 15 days
48 hours
24 hours

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