Civil Engineering MCQs

Page No. 45

The sewer pipes__________________?


aCarry sewage as gravity conduits

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bAre designed for generating self-cleansing velocities at different discharge

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cShould resist the wear and tear caused due to abrasion

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dAll the above

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View Answer All the above

The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?


a0.05552 cumec

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b0.05554 cumec

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c0.05556 cumec

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d0.0556 cumec

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View Answer 0.05556 cumec

Pick up the correct statement from the following?


aThe water supply pipes carry pure water free from solid particles

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b The water supply pipes get clogged if flow velocity is less than self cleansing velocity

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cThe sewers may be carried up and down the hills and valleys

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dThe sewer pipes are generally laid along level hills

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The temperature affects the________________?


aBiological activity of bacteria in sewage

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bSolubility of gases in sewage

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c Viscosity of sewage

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d All the above

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View Answer All the above

Sludge banks are formed if sewage is disposed of in____________________ ?


aRivers

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bSeas

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cLakes

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dNone of these

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View Answer Seas

Chlorination of water is done for the removal of____________________?


aBacterias

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bSuspended solids

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cSediments

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dHardness

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View Answer Bacterias

The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________?


aInverted syphon

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bDepressed sewer

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cSag pipe

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dall of these

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View Answer all of these

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________?


a1.5

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b 2.0

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c 3.0

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d 4.0

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View Answer 2.0

In a grit chamber of a sewage treatment plant ____________________?


aFlow velocity 0.15 m to 0.3 m/sec is kept

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bDepth of 0.9 m to 1.20 m is kept

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cOne minute of detention period is kept

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d All the above

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View Answer All the above

Pick up the correct statement from the following ?


aSmall sewers are cleaned by flushing

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bMedium sewers are cleaned by cane rodding

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c Medium sewers may be cleaned by pills

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dAll the above

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View Answer All the above

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