Civil Engineering MCQs

Page No. 50

The sewer which received discharge from two or more main sewers, is known as_______________?


aA trunk sewer


bAn outfall sewer


cA main sewer


d An intercepting sewer


View Answer A trunk sewer

Hydraulic mean radius is_______________?


aMean radius of sewer


bDifference in heads between two points in circular pipes


cMean of radii in a pipe line of varying cross -sections


dCross-sectional area/wetted perimeter



Traps_________________?


a Are water seals which prevent the entry of foul gases


bAre used to trap the rats entering sewers


cDissolve the foul gases


d Create symphonic action to increase the quick disposal of sewerage



Aerobic bacterias___________________?


aFlourish in the presence of free oxygen


bConsume organic matter as their food


cOxidise organic matter in sewage


dAll the above


View Answer All the above

¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?


a Low estimates of the average and maximum flows


bLarge scale infiltration of storm water


cUnexpected increase in population


dAll the above


View Answer All the above

Dry weather flow is__________________?


aAverage daily rate of flow


bAverage monthly rate of flow


cAverage annual rate of flow


d Water supply allowance per capita



The rational formula for peak drainage discharge, was evolved by_________________?


aFruhling


bLloyd David


cKuichling


d All of these


View Answer All of these

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 Ps = 900/(t + 60) the maximum run off is__________________?


a 0.10 cumec


b0.12 cumec


c0.15 cumec


d 0.20 cumec


View Answer 0.15 cumec

Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?


aBoth A and R are true and R is the correct explanation of A


bBoth A and R are true but R is not a correct explanation of A


c A is true but R is false


dA is false but R is true



For the open drain (N = 0.025) shown in the below figure, the discharge is________________?


a26.88 cumecs


b27.88 cumecs


c 28.88 cumecs


d29.88 cumecs


View Answer 28.88 cumecs

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