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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