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Waste Water Engineering

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
500 cm/sec
413.5 cm/sec

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Waste Water Engineering
The sewer which resists sulphide corrosion, is

Lead sewer
R.C. sewer
Cast iron sewer
Brick sewer

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

Skimming
Screening
None of these
Filtration

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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
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

10 cm
18 cm
12 cm
15 cm

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Waste Water Engineering
At the junction of sewers

Top of larger sewer is kept lower
Tops of both the sewers are at the same level
None of these
Top of smaller sewer is kept lower

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