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Waste Water Engineering

Waste Water Engineering
The gas evolved in sewers is

Carbondioxide
Methane
Hydrogen sulphide
All of these

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Waste Water Engineering
The formula V = (1/n) r2/3

Manning’s formula
Kutter’s formula
Chezy’s formula
Bazin’s formula

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Bazin
Manning
Kutter
Chezy

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

0.5 to 1.0 kg
5 kg to 7.5 kg
1 kg to 2.0 kg
7.5 kg to 10 kg

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Rectangular
Circular
Egg shaped
Horse shoe shaped

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

Is only provided
Is doubled
Is trebled
Is not enough

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