Civil Engineering - Waste Water Engineering
Exercise :: Waste Water Engineering - Section 3
26. |
The rainfall at any place may be determined by |
A. |
its intensity | B. |
its direction | C. |
its frequency | D. |
all the above. |
Answer: Option D
Explanation:
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27. |
In trickling filter, B.O.D. is reduced to |
A. |
30 to 40% | B. |
40 to 60% | C. |
60 to 80% | D. |
80 to 90% | E. |
95%. |
Answer: Option C
Explanation:
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28. |
Which one of the following gases is most significant as air pollutant |
A. |
Carbondioxide | B. |
Oxygen | C. |
Nitrogen | D. |
Sulphurdioxide. |
Answer: Option D
Explanation:
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29. |
Which one of the following statements regarding septic tanks is wrong : |
A. |
a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided | B. |
the outlet invert level is kept 5 to 7.5 cm below the inlet invert level | C. |
the minimum width of septic level is 90 cm | D. |
the depth of tank is kept equal to its width. |
Answer: Option D
Explanation:
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30. |
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient, |
A. |
is only provided | B. |
is doubled | C. |
is trebled | D. |
is not enough. |
Answer: Option B
Explanation:
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