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Waste Water Engineering

Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is

1.250 D
1.350 D
1.625 D
1.425 D

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Waste Water Engineering
Imhoff cone is used to determine

Suspended solids
Dissolved solids
Settleable solids
None of these

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Methane
Carbon dioxide
Oxygen
Hydrogen sulphide

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

150 mg/l
100 mg/l
50 mg/l
250 mg/l

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Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

Size and shape of solid
Viscosity of water
All listed here
Velocity of flow

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Waste Water Engineering
The minimum recommended diameter of sewers, is

5 cm
10 cm
20 cm
15 cm

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