Civil Engineering MCQs

Page No. 169

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


a 5 to 10 cm/sec.

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b15 to 30 cm/sec.

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c15 to 30 cm/minute

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d15 to 30 cm/hour

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View Answer 15 to 30 cm/minute

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


aparticle size is decreased

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b the surface area of tank is increased

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cthe depth of tank is decreased

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dnone of the above

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View Answer none of the above

The overflow rate for plain sedimentation tanks is about__________________?


a500 to 750 litres/hour/ m2

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b1000 to 1250 litres/hour/ m2

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c1250 to 1500 litres/hour/m2

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d1500 to 2000 litres/hour/m2

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


adepth of tank

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bsurface area of tank

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c both depth and surface area of tank

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dnone of the above

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View Answer surface area of tank

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


aincreasing the depth of tank

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bdecreasing the depth of tank

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c increasing the surface area of tank

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ddecreasing the surface area of tank

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


aincrease in turbidity of water

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bdecrease in turbidity of water

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cincrease in temperature of water

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dA and C

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View Answer A and C

The detention period in coagulation tanks is usually kept as_______________?


a1 to 2 minutes

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b30 to 45 minutes

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c 2 to 6 hours

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d2 to 6 days

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View Answer 2 to 6 hours

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


asulphuric acid

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b copper sulphate

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clime

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d sodium permanganate

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View Answer lime

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


a50 to 60

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b100 to 150

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c500 to 600

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d1400 to 1500

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View Answer 50 to 60

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


aslower filtration rate

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bhigher filtration rate

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clesser efficiency in removal of bacteria

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dA and C

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View Answer A and C

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