Civil Engineering MCQs

Page No. 50

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


aA trunk sewer

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bAn outfall sewer

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cA main sewer

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d An intercepting sewer

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View Answer A trunk sewer

Hydraulic mean radius is_______________?


aMean radius of sewer

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bDifference in heads between two points in circular pipes

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

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dCross-sectional area/wetted perimeter

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Traps_________________?


a Are water seals which prevent the entry of foul gases

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bAre used to trap the rats entering sewers

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cDissolve the foul gases

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d Create symphonic action to increase the quick disposal of sewerage

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Aerobic bacterias___________________?


aFlourish in the presence of free oxygen

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bConsume organic matter as their food

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cOxidise organic matter in sewage

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dAll the above

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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

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bLarge scale infiltration of storm water

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cUnexpected increase in population

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dAll the above

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View Answer All the above

Dry weather flow is__________________?


aAverage daily rate of flow

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bAverage monthly rate of flow

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cAverage annual rate of flow

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d Water supply allowance per capita

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


aFruhling

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bLloyd David

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cKuichling

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d All of these

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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

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b0.12 cumec

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c0.15 cumec

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d 0.20 cumec

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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

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

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c A is true but R is false

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dA is false but R is true

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


a26.88 cumecs

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b27.88 cumecs

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c 28.88 cumecs

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d29.88 cumecs

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View Answer 28.88 cumecs

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