A. One pipe
B. Two pipes
C. Three pipes
D. Four pipes
Correct Answer: Three pipes ✔
Last Updated: August 25, 2020
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- If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains__________?
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- Dilution method of disposing of sewage, is not preferred to__________?
- 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__________?
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- The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known__________?
- Water content of sewage is about__________?
- The most efficient cross-section of sewers in a combined sewerage system is__________?
- The factor responsible for purification of sewage in river is__________?
- To maintain aerobic biological activity, the moisture content of the compost mass should be about__________?
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