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Environmental Engineering

Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Acidic and alkaline
Both acidic
Both alkaline
Alkaline and acidic

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Environmental Engineering
The biochemical treatment of sewage effluents is essentially a process of

Alkalinization
Oxidation
Reduction
Dehydration

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Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

10.5 to 12.0
4.5 to 6.0
6.5 to 8.0
8.5 to 10.0

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Environmental Engineering
Sewerage system is usually designed for

27 years
25 years
28 years
26 years

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Environmental Engineering
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is

Equivalent pipe method
Hardy cross method
Circle method
Electrical analysis method

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

Skimming tanks
Grit chambers
Detritus tanks
Sedimentation tanks

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