Civil Engineering MCQs

Page No. 29

The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?


a2 to 3 mm

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b 3 to 5 mm

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c5 to 8 mm

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d8 to 10 mm

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View Answer 2 to 3 mm

The rate of accumulation of sludge per person per year, is_______________________?


a10 litres

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b 15 litres

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c20 litres

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d25 litres

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View Answer 20 litres

In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?


aIs only provided

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b Is doubled

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cIs trebled

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d Is not enough

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View Answer Is doubled

The flow velocity in detritus tanks is________________?


a 0.05 m/sec

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b0.09 m/sec

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c1.25 m/sec

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dNone of these

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View Answer 0.09 m/sec

The water carried sewerage system removes__________________?


aDomestic sewage

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bIndustrial sewage

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cStorm sewage

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d All the above

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View Answer All the above

The asbestos cement pipes are generally laid___________________?


aHorizontally

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bVertically

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cAt an angle of 30°

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dAt an angle of 60°

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View Answer Vertically

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?


aCarbondioxide gas

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bHydrogen sulphide gas

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cMethane gas

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dPetrol vapours

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View Answer Methane gas

If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?


a50 mg/l

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b100 mg/l

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c150 mg/l

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d 250 mg/l

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View Answer 250 mg/l

A circular sewer section is preferred to because__________________?


a It is cheaper in construction

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bIt provides maximum area for a given perimeter

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cIt provides maximum hydraulic mean depth

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d All the above

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View Answer All the above

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?


a5

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b10

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c15

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d20

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View Answer 20

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