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Waste Water Engineering

Waste Water Engineering
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

Is doubled
Is only provided
Is not enough
Is trebled

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Waste Water Engineering
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

Q/(B × D)
Q/(B × L)
Q/L
Q/(L × D)

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Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

30 cm c/c
15 cm c/c
50 cm c/c
22.5 cm c/c

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Waste Water Engineering
The pH value of sewage is determined with the help of

Turbid meter
Imhoff Cone
None of these
Potentiometer

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Waste Water Engineering
During preliminary treatment of a sewage

Floating materials are removed by screening
Oil and grease are removed from skimming tanks
Girt and sand are removed by girt chambers
All listed here

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

None of these
Potassium permanganate
Phenol-di -sulphuric acid potassium hydroxide
Sulphuric acid and napthamine

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