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Waste Water Engineering

Waste Water Engineering
The drop man holes are generally provided in sewers for

Large town ships
Hilly town ships
Cities in plains
Industrial areas

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Waste Water Engineering
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

Reciprocating pump
Pneumatic ejector
None of these
Centrifugal pump

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Waste Water Engineering
Sewer manholes are generally provided at

The junctions of sewers
All of these
The change of direction
The change of gradient

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Waste Water Engineering
During preliminary treatment of a sewage

Oil and grease are removed from skimming tanks
All listed here
Floating materials are removed by screening
Girt and sand are removed by girt chambers

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

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

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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
Hydrogen sulphide
Oxygen
Methane

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