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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
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.84 D
D’ = 0.64 D
D’ = 0.74 D
D’ = 0.94 D

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Waste Water Engineering
Imhoff cone is used to measure

Settleable solids
Total organic solids
Total in organic solids
Total solids

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Waste Water Engineering
Imhoff cone is used to determine

Settleable solids
Dissolved solids
None of these
Suspended solids

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

313.5 cm/sec
213.5 cm/sec
413.5 cm/sec
500 cm/sec

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Nitrates are formed
Ammonia is formed
Nitrites are formed
Carbondioxide is formed

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