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Waste Water Engineering

Waste Water Engineering
If the pH value of sewage is 7

None of these
It is alkaline
It is acidic
It is neutral

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

With elliptical cage
Both A and B
Near the outer surface of the pipe
Near the inner surface of the pipe

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Waste Water Engineering
Dried sewage after treatment is used as

Base material for paints
Fertilizer
Chemical for lowering B.O.D.
Building material

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

4
2
1.5
3

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Waste Water Engineering
A rainfall may be classified as acidic if its pH value is less or equal to

6.5
7
5
6

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Waste Water Engineering
The discharge per unit plan area of a sedimentation tank, is generally called

Over flow rate
Surface loading
All of these
Over flow velocity

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