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Waste Water Engineering

Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

3.5 to 4.5 m/sec
4.5 to 5.5 m/sec
2.5 to 3.0 m/sec
3.0 to 4.0 m/sec

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Waste Water Engineering
Pick up the incorrect size of stone ware sewers

67.5 cm
None of these
82.5 cm
52.5 cm

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

Rectangular
Circular
Parabolic
New egged

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Waste Water Engineering
Antisyphonage pipe is fitted

At the beginning of sewer line
At the end of septic tanks
With a W.'trap
On manholes

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Waste Water Engineering
A circular sewer section is preferred to because

It provides maximum area for a given perimeter
It provides maximum hydraulic mean depth
All listed here
It is cheaper in construction

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Waste Water Engineering
Lead acetate test in sewer manhole is done to test the presence of

Methane gas
Diesel vapours
Carbondioxide gas
Hydrogen sulphide

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