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Waste Water Engineering

Waste Water Engineering
The algae dies out in the zone of

Cleaner water
Degradation
Active decomposition
Recovery

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Waste Water Engineering
Removal of oil and grease from sewage, is known

Skimming
Screening
Filtration
None of these

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

Diesel vapours
Carbondioxide gas
Methane gas
Hydrogen sulphide

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

The flow of sewage to fill the tank
None of these
A particle to travel from top surface to bottom sludge zone
A particle to travel along its length

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

413.5 cm/sec
500 cm/sec
313.5 cm/sec
213.5 cm/sec

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

Industrial areas
Cities in plains
Large town ships
Hilly town ships

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