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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

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

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Waste Water Engineering
The most efficient cross section of sewers in a separate sewerage system is

New egged
Circular
Parabolic
Rectangular

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

A breaker
A jar
An Imhoff cone
A test tube

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d² (0.011d + 0.785H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Invert level of a branch sewer is more than 60 cm that of the main sewer
Two sewer lines intersect
Sewer line runs along a main road
Ordinary manhole cannot be built

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

4 hours
2 hours
8 hours
6 hours

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