Civil Engineering - Waste Water Engineering

16. 

Drop manholes at the junctions of sewer lines, are provided if

A. invert level of a branch sewer is more than 60 cm that of the main sewer
B. sewer line runs along a main road
C. ordinary manhole cannot be built
D. two sewer lines intersect.

Answer: Option A

Explanation:

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17. 

The most effective arrangement for diverting excess storm water into a natural drainage, is

A. leaping weir
B. overflow weir
C. siphon spill way
D. none of these.

Answer: Option C

Explanation:

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18. 

Large diameter sewers subjected to external pressure alone, are reinforced

A. near the inner surface of the pipe
B. near the outer surface of the pipe
C. both (a) and (b)
D. with elliptical cage
E. none of these.

Answer: Option D

Explanation:

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19. 

Pick up the correct statement from the following :

A. The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor
B. The automatic purification of polluted water, is known self purification phenomenon
C. The photosynthesis is carried out in the presence of sun light
D. Grab sample is generally obtained from the surface where turbulence mixes the sewage particles
E. All the above.

Answer: Option E

Explanation:

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20. 

In sewage, the solids in mg per litre is

A. 100 to 500
B. 500 to 1000
C. 1000 to 1500
D. 1500 to 2000

Answer: Option B

Explanation:

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