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Waste Water Engineering

Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.01
0.013
0.012
0.011

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Waste Water Engineering
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

208 cu.m
212 cu.m
216 cu.m
204 cu.m

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Waste Water Engineering
At the junction of sewers

Top of larger sewer is kept lower
None of these
Top of smaller sewer is kept lower
Tops of both the sewers are at the same level

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Waste Water Engineering
Fresh sewage may become stale in

Six hours
Three to four hours
Two to three hours
One hour

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

A breaker
A jar
An Imhoff cone
A test tube

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

100 mg/l
400 mg/l
200 mg/l
300 mg/l

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