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Waste Water Engineering

Waste Water Engineering
The laying of sewers is done with

Clinometer
Level
Magnetic compass
Theodolite

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Waste Water Engineering
The minimum diameter of a sewer is kept

25 cm
15 cm
20 cm
10 cm

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Neither silting nor scouring occurs at the bottom
Both silting and scouring occur at the bottom
The bottom is silted
The bottom is scoured

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

200 mg/l
100 mg/l
400 mg/l
300 mg/l

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Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

None of these
1 in 100
1 in 120
1 in 60

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Waste Water Engineering
Sewer ventilating columns are generally placed at

All listed here
Distances 150 m to 300 m
Upper ends of branch sewers
Every change in the size of sewers

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