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WASTE WATER ENGINEERING

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
500 cm/sec
413.5 cm/sec

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

A test tube
A jar
A breaker
An Imhoff cone

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% more
10% more
10% less
20% less

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Half full
Two third full
Full depth
Three fourth full

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]

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