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


b 3 to 5 mm


c5 to 8 mm


d8 to 10 mm


View Answer 2 to 3 mm

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


a10 litres


b 15 litres


c20 litres


d25 litres


View Answer 20 litres

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


aIs only provided


b Is doubled


cIs trebled


d Is not enough


View Answer Is doubled

The flow velocity in detritus tanks is________________?


a 0.05 m/sec


b0.09 m/sec


c1.25 m/sec


dNone of these


View Answer 0.09 m/sec

The water carried sewerage system removes__________________?


aDomestic sewage


bIndustrial sewage


cStorm sewage


d All the above


View Answer All the above

The asbestos cement pipes are generally laid___________________?


aHorizontally


bVertically


cAt an angle of 30°


dAt an angle of 60°


View Answer Vertically

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


aCarbondioxide gas


bHydrogen sulphide gas


cMethane gas


dPetrol vapours


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


b100 mg/l


c150 mg/l


d 250 mg/l


View Answer 250 mg/l

A circular sewer section is preferred to because__________________?


a It is cheaper in construction


bIt provides maximum area for a given perimeter


cIt provides maximum hydraulic mean depth


d All the above


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


b10


c15


d20


View Answer 20

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