A drop manhole is provided if a sewer drops from a height a branch sewer joins t

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Question
A drop manhole is provided if
Options
A. a sewer drops from a height
B. a branch sewer joins the main sewer at higher level
C. a lamp is inserted to check obstruction
D. none of these.

Correct Answer

a branch sewer joins the main sewer at higher level

Waste Water Engineering problems

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1. During preliminary treatment of a sewage
Options
A. Oil and grease are removed from skimming tanks
B. Floating materials are removed by screening
C. Girt and sand are removed by girt chambers
D. All the above.

2. The clarigesters are
Options
A. circular septic tanks
B. rectangular septic tanks
C. circular Imhoff double tanks with bottom hoppers
D. circular Imhoff double storey tanks without bottom hoppers.

4. Pick up the correct statement from the following :
Options
A. The larger the sewer in size, more will be velocity
B. The smaller the sewer in size, less will be velocity
C. The larger the sewer in size, no deposition will take place
D. The larger the sewer in size, deposition will take place.

5. The effluent of a septic tank is
Options
A. fit for discharge into any open drain
B. foul and contains dissolved and suspended solids
C. as good as that from a complete treatment
D. none of these.

6. Nitrogen cycle of sewage, is
Options
A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
E. None of these.

7. The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is
Options
A. 0.10 cumec
B. 0.12 cumec
C. 0.15 cumec
D. 0.20 cumec.

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