A. 1
B. 2 to 3
C. 3 to 5
D. 5 to 10
Correct Answer: 1 ✔
Last Updated: August 25, 2020
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- The gas which may cause explosion in sewers, is__________?
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- If q is the average sewage flow from a city of population P, the maximum sewage flow__________?
- If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is__________?
- If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains__________?
- The sewage treatment units in which anaerobic decomposition of organic matter is used, are called__________?
- If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is__________?
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- Imhoff cone is used to measure__________?
- 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__________?
- For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of__________?
- In sewers the velocity of flow should not be__________?
- In sewers the effect of scouring is more on__________?
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- In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is__________?
- 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__________?
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- Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to__________?
- If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is__________?
- For evaporation and measurement of settable solids, the apparatus used, is__________?