Civil Engineering - Waste Water Engineering

46. 

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

A. 1.095
B. 1.085
C. 1.075
D. 1.065

Answer: Option A

Explanation:

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47. 

Pick up the correct statement from the following :

A. The maximum rate of storm run off is called peak drainage discharge
B. Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares
C. The period after which the entire area starts contributing to the run off, is called the time of concentration
D. The time required by water to reach the outlet of a catchment from the most remote point, is called time of concentration
E. All the above.

Answer: Option E

Explanation:

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48. 

For trunk and out-fall, the type of sewers generally used, is

A. standard egg shaped
B. circular shaped
C. horse shoe shaped
D. parabolic shaped
E. semi-elliptical shaped.

Answer: Option C

Explanation:

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49. 

Pick up the incorrect statement from the following :

A. Septic tanks are horizontal continuous flow type of sedimentation tanks
B. Septic tanks are generally provided a detention period of 12 to 36 hours
C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
D. Septic tanks are generally classified as tanks which work on the principle of anaerobic decomposition
E. None of these.

Answer: Option E

Explanation:

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50. 

Hydraulic mean radius is

A. mean radius of sewer
B. difference in heads between two points in circular pipes
C. mean of radii in a pipe line of varying cross-sections
D. cross-sectional area/wetted perimeter.

Answer: Option D

Explanation:

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