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Waste Water Engineering

Waste Water Engineering
In SI units the power of sound is represented in

Joules
Kgs
Watts
Newtons

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Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Alum
Ferric sulphate
Chlorinated coppers
Ferric chloride

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Waste Water Engineering
The self-cleansing velocity of water flowing through pipe lines, is

1 metre/sec
0.5 metre/sec
2 metres/sec
0.25 metre/sec

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Recovery
Cleaner water
Degradation
Active decomposition

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

6 hours
8 hours
2 hours
4 hours

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Waste Water Engineering
Water content of sewage is about

0.999
0.99
0.9
0.95

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