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Waste Water Engineering

Waste Water Engineering
The sewerage system consists of

Branch sewer
All of these
Lateral sewer
House sewer

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Waste Water Engineering
Drop manholes are the manholes

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

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 503 upward
1 in 100 downward
1 in 500 upward
1 in 100 upward

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d² (0.011d + 0.785H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q

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Waste Water Engineering
Aerobic bacterias

Oxidise organic matter in sewage
Consume organic matter as their food
Flourish in the presence of free oxygen
All of these

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

3 ppm
10 ppm
5 ppm
4 ppm

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