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Waste Water Engineering

Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.7 to 0.9 m
0.4 to 0.5 m
0.5 to 0.7 m
0.9 to 1.20 m

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

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

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Waste Water Engineering
Drop manholes are the manholes

Without entry ladders
Without manhole covers
With depths more than 3.5 m
Having drains at different levels

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Waste Water Engineering
For drainage pipes in buildings the test applied before putting them to use, is

All listed here
Smoke test
Straightness test
Water test

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

30 days
60 days
15 days
90 days

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Waste Water Engineering
In detritus tanks,

Organic and inorganic materials are separated
Flow velocity is kept 0.09 m/sec
Detention period is kept 3 to 4 minutes
All listed here

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