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Waste Water Engineering

Waste Water Engineering
Imhoff cone is used to measure

Settleable solids
Total solids
Total in organic solids
Total organic solids

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Rectangular
Circular
Parabolic
New egged

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Average demand
Twice the average demand
Four times the average demand
Thrice the average demand

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Waste Water Engineering
The asbestos cement sewers are

All of these
Not structurally strong to bear large compressive stress
Susceptible to corrosion by sulphuric acid
Light in weight

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

5000
1000
10000
100

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