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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 4
26.
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
manually
mechanically
hydraulically
electrically.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
The gas evolved in sewers is
Carbondioxide
Hydrogen sulphide
Methane
All of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
The maximum depth of sedimentation tanks, is kept
3 m
3.5 m
4 m
6 m.
Answer: Option
Explanation:
In India, the maximum depth of sedimentation tanks is generally kept between 3 to 6 meters.
29.
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
1 in 100 upward
1 in 500 upward
1 in 100 downward
1 in 503 upward.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
The detention time (t) of a settling tank, may be defined as the time required for
a particle to travel along its length
a particle to travel from top surface to bottom sludge zone
the flow of sewage to fill the tank
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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