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Waste Water Engineering

Waste Water Engineering
The most widely used pump for lifting sewage is

Pneumatic ejector
Reciprocating pump
Centrifugal pump
Air pressure pump

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

8 to 10 mm
3 to 5 mm
5 to 8 mm
2 to 3 mm

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

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Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Neither A nor B
Both A and B
Concreting
Raising low lying areas by dumping

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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
5 hours
3 hours

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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

Methane
Hydrogen sulphide
Carbon dioxide
Oxygen

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