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Waste Water Engineering

Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

20 m
24 m
30 m
16 m

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

18 cm
10 cm
12 cm
15 cm

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Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

4 hours
3 hours
5 hours
2 hours

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

150 mm dia
All of these
225 mm dia
100 mm dia

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Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
All of these
The shape is rectangular
Detention period is 2 hours

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrites
Free ammonia
None of these
Nitrates

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