Civil Engineering MCQs

Page No. 23

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?


aHydrogen sulphide


bCarbon dioxide


cMethane


dOxygen


View Answer Carbon dioxide

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?


a Imhoff tanks


bTrickling filters


cSludge sedimentation tanks


d None of these


View Answer Trickling filters

If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?


a1 in 60


b 1 in 100


c1 in 120


dNone of these


View Answer 1 in 100

The grit and silt of the grit chambers, may not be used for_________________?


aRaising low lying areas by dumping


bConcreting


cBoth A. and B.


d Neither A. nor B


View Answer Concreting

Imhoff cone is used to measure________________?


a Total organic solids


bTotal solids


cTotal in organic solids


d Settleable solids


View Answer Settleable solids

Dilution method of disposing of sewage, is not preferred to_______________?


aWhen sewage is fresh


bWhen diluting water has high dissolved oxygen content


c When diluting water is used for water supply near the point of sewage disposed


dWhen the diluting water is having flow currents



The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?


a1 in 100 upward


b 1 in 500 upward


c 1 in 100 downward


d1 in 503 upward


View Answer 1 in 100 downward

For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?


aH2SO4


bHNO3


cHCl


dNone of these


View Answer H2SO4

In sewers the velocity of flow should not be_________________?


aMore than the self-cleansing velocity


b Less than the self-cleansing velocity


c Less than 10 m/sec


dMore than 20 m/sec



In sewers the effect of scouring is more on__________________?


aTop side


bBottom side


cHorizontal side


dAll sides


View Answer Bottom side

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