Civil Engineering - Waste Water Engineering

41. 

In Chezy's formula V = C rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is

A. D
B.
C.
D.
E.

Answer: Option D

Explanation:

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42. 

The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

A. house sewer
B. lateral sewer
C. branch sewer
D. sewer outfall.

Answer: Option D

Explanation:

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43. 

If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

A. 50 ppm
B. 100 ppm
C. 150 ppm
D. 200 ppm
E. 250 ppm.

Answer: Option D

Explanation:

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44. 

Setting out the alignments of sewers may start from

A. city
B. out-fall
C. tail end
D. any point.

Answer: Option C

Explanation:

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45. 

If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
E. None of these.

Answer: Option C

Explanation:

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