Civil Engineering MCQs

Page No. 169

The velocity of flow of water in a sedimentation tank is about__________________?


a 5 to 10 cm/sec.


b15 to 30 cm/sec.


c15 to 30 cm/minute


d15 to 30 cm/hour


View Answer 15 to 30 cm/minute

The settling velocity of a particle in a sedimentation tank increases if_________________?


aparticle size is decreased


b the surface area of tank is increased


cthe depth of tank is decreased


dnone of the above


View Answer none of the above

The overflow rate for plain sedimentation tanks is about__________________?


a500 to 750 litres/hour/ m2


b1000 to 1250 litres/hour/ m2


c1250 to 1500 litres/hour/m2


d1500 to 2000 litres/hour/m2



The settling velocity of a particle in a sedimentation tank depends on__________________?


adepth of tank


bsurface area of tank


c both depth and surface area of tank


dnone of the above


View Answer surface area of tank

For a given discharge, the efficiency of sedimentation tank can be increased by______________?


aincreasing the depth of tank


bdecreasing the depth of tank


c increasing the surface area of tank


ddecreasing the surface area of tank



The amount of coagulant needed for coagulation of water increases with_______________?


aincrease in turbidity of water


bdecrease in turbidity of water


cincrease in temperature of water


dA and C


View Answer A and C

The detention period in coagulation tanks is usually kept as_______________?


a1 to 2 minutes


b30 to 45 minutes


c 2 to 6 hours


d2 to 6 days


View Answer 2 to 6 hours

The chemical most commonly used to increase speed of sedimentation of sewage is_______________?


asulphuric acid


b copper sulphate


clime


d sodium permanganate


View Answer lime

The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?


a50 to 60


b100 to 150


c500 to 600


d1400 to 1500


View Answer 50 to 60

As compared to rapid sand filters, slow sand filters give______________?


aslower filtration rate


bhigher filtration rate


clesser efficiency in removal of bacteria


dA and C


View Answer A and C

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