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Waste Water Engineering

Waste Water Engineering
The sewer that unloads the sewage at the point of treatment is called

Main sewer
Outfall sewer
Branch sewer
House sewer

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Ammonia
Carbondioxide
Carbon monoxide
Methane

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

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

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Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Dysentery
Typhoid
Cholera
All listed here

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

None of these
Both types of bacterias
Aerobic bacteria
Anaerobic bacteria

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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