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Waste Water Engineering

Waste Water Engineering
A rainfall may be classified as acidic if its pH value is less or equal to

6.5
7
5
6

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

10 days
30 days
20 days
60 days

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Waste Water Engineering
Clogging of sewers, is caused due to

Low discharge
Silting
All of these
Greasy and oily matters

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Waste Water Engineering
Dry water flow in a combined sewer, is

Domestic sewage
Industrial sewage
Inclusive of domestic and industrial sewage but excludes storm water
Storm water

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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

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

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(18 + )/(4 + )] q
Q = [(5 + )/((15 + )] q
Q = [(4 + )/(18 + )] q
Q = [(18 + P)/(4 + )] q

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