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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

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

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

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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

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

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Waste Water Engineering
The sewer which received discharge from two or more main sewers, is known as

An outfall sewer
An intercepting sewer
A main sewer
A trunk sewer

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

One minute of detention period is kept
All of these
Flow velocity 0.15 m to 0.3 m/sec is kept
Depth of 0.9 m to 1.20 m is kept

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Waste Water Engineering
The asbestos cement pipes are generally laid

Vertically
Horizontally
At an angle of 60°
At an angle of 30°

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