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Waste Water Engineering

Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

10% less
20% more
10% more
20% less

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Waste Water Engineering
The liquid wastes from kitchens, bath rooms and wash basins, is not called

None of these
Sewage
Liquid waste
Sullage

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

25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

120 cm
100 cm
110 cm
150 cm

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

225 mm dia
150 mm dia
All of these
100 mm dia

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
Hydrology
All listed here
Dissolved oxygen in water

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