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Waste Water Engineering

Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Both A and B
Comminutor
Shredder
Neither A nor B

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

0.011
0.013
0.01
0.012

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Adding potassium permanganate
Adding sulphuric acid
Boiling
Phenol-di-sulphuric acid

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Width of the tank is normally kept about 6 m
Maximum horizontal flow velocity is limited to 0.3 m/minute
All listed here
Length of the tank is normally kept 4 to 5 times the width

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
All listed here
Dissolved oxygen in water
Hydrology

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

7 m
5 m
6.5 m
5.5 m

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