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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 not enough
Is doubled
Is trebled
Is only provided

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Greater than 0.1 mm
Less than 0.05 mm
Less than 0.01 mm
Less than 0.1 mm

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Waste Water Engineering
The gas evolved in sewers is

Carbondioxide
Hydrogen sulphide
All of these
Methane

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

100 cm
120 cm
110 cm
150 cm

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Bronchitis
Heart disorder
Skin cancer
Lung cancer

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Waste Water Engineering
Setting out the alignments of sewers may start from

City
Any point
Tail end
Out-fall

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