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Waste Water Engineering

Waste Water Engineering
Discrete or granular particles change their

Size
None of these
Weight
Shape

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Cement concrete sewers
Glazed bricks sewers
Stone ware sewers
Cast iron sewers

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Waste Water Engineering
If the pH value of sewage is 7

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

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% less
20% more
10% less
10% more

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Waste Water Engineering
In sewers the effect of scouring is more on

All sides
Horizontal side
Top side
Bottom side

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

10000
5000
100
1000

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