Civil Engineering - Waste Water Engineering

41. 

In septic tanks,

A. free board of 0.3 m may be provided
B. the baffles or tees are extended up to top level of scum
C. the clear space between the baffle top and covering slab is about 7.5 cm
D. the inlet is kept 30 cm below the sewage line and outlet is kept at a level 40% depth of the sewage
E. all the above.

Answer: Option E

Explanation:

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42. 

The sewer pipe which carries sewage from a building for immediate disposal is

A. house sewer
B. lateral sewer
C. intercepting sewer
D. main sewer.

Answer: Option A

Explanation:

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43. 

The algae dies out in the zone of

A. degradation
B. active decomposition
C. recovery
D. cleaner water.

Answer: Option A

Explanation:

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44. 

The recommended detention period for grit chambers is

A. 1 minute
B. 2 minutes
C. 3 minutes
D. 5 minutes.

Answer: Option A

Explanation:

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45. 

Pick up the correct statement from the following :

A. The materials separated by screens, is called screenings
B. The screenings are disposed off either by burning or by burial or by dumping
C. The process of burning the screenings, is called incineration
D. The process of burning the screenings, is known as compositing
E. All the above.

Answer: Option E

Explanation:

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