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Waste Water Engineering

Waste Water Engineering
The rate of accumulation of sludge per person per year, is

15 litres
25 litres
20 litres
10 litres

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Waste Water Engineering
pH value of sludge during alkaline regression stage, is

Less than 6
More than 7
Less than 7
More than 6

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

1000
5000
10000
100

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Waste Water Engineering
The gradient of sewers depends upon

Velocity of flow
Discharge
All listed here
Diameter of the sewer

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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
213.5 cm/sec
313.5 cm/sec

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Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

100 cm
120 cm
160 cm
140 cm

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