Civil Engineering MCQs

Page No. 43

In detritus tanks______________________?


aFlow velocity is kept 0.09 m/sec


bDetention period is kept 3 to 4 minutes


cOrganic and inorganic materials are separated


dAll the above


View Answer All the above

The screens are fixed___________________?


aPerpendicular to the direction of flow


bParallel to the direction of flow


c At an angle 30° to 60° to the direction of flow


dNone of these



Pathogens (or pathogenic bacterias) in water may cause___________________?


aTyphoid


bCholera


cDysentery


d All the above


View Answer All the above

The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in__________________?


aChezy’s formula


bBazin’s formula


cKutter’s formula


dManning’s formula


View Answer Bazin’s formula

For large sewers, maximum distance between manholes may be_______________?


a50 m


b100 m


c200 m


d300 m


View Answer 300 m

Pick up the incorrect statement from the following ?


aSeptic tanks are horizontal continuous flow type of sedimentation tanks


bSeptic tanks are generally provided a detention period of 12 to 36 hours


cSeptic tanks are completely covered and high vent shafts are provided for the escape of foul gases


d None of these


View Answer None of these

For sewers, inverted siphon is provided for___________________?


a One pipe


bTwo pipes


cThree pipes


dFour pipes


View Answer Three pipes

Which one of the following gases is most significant as air pollutant ?


aCarbondioxide


bOxygen


cNitrogen


dSulphur-dioxide


View Answer Sulphur-dioxide

A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?


a2.30 m


b2.40 m


c2.45 m


d2.50 m


View Answer 2.45 m

Depletion of ozone layer in the outer atmosphere may cause___________________ ?


aLung cancer


bSkin cancer


cBronchitis


dHeart disorder


View Answer Skin cancer

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