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Waste Water Engineering

Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.55
2.5
2.25
2.65

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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

2 hours
4 hours
3 hours
5 hours

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 503 upward
1 in 100 upward
1 in 500 upward
1 in 100 downward

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

3
1.5
2
4

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

90 cm
50 cm
100 cm
80 cm

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Carbon dioxide
Oxygen
Methane
Hydrogen sulphide

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