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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 4
36.
In sewers the velocity of flow should not be
more than the self-cleansing velocity
less than the self-cleansing velocity
less than 10 m/sec
more than 20 m/sec.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
D' = 0.64 D
D' = 0.74 D
D' = 0.84 D
D' = 0.94 D.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
Hydrogen sulphide
Carbon dioxide
Methane
Oxygen
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
The design period of sewage treatment works in normally
5 - 10 years
15 - 20 years
30 - 40 years
40 - 50 years.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
The porosity of sediments in sewer pipes, is usually taken as
0.010
0.011
0.012
0.013
0.020
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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