Civil Engineering MCQs

Page No. 41

The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?


a5 m


b5.5 m


c6.5 m


d7 m


View Answer 7 m

The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?


a25,000 to 35,000 litres/sqm/day


b40,000 to 50,000 litres/sqm/day


c50,000 to 60,000 litres/sqm/day


d 80,000 to 10,000 litres/sqm/day



If the pH value of sewage is 7__________________?


a It is acidic


b It is alkaline


c It is neutral


dNone of these


View Answer It is neutral

For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?


a1.5


b2.0


c2.5


d3.0


View Answer 1.5

Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?


apt = 3H3p/2 Z5


bpt = 2H3p/3 Z5


cpt = 3H3p/2Z5


d pt = 2 3p/3Z5


View Answer pt = 3H3p/2 Z5

Ventilating shafts are provided to a sewer line at every__________________?


a100 m


b150 m


c200 m


d 300 m


View Answer 300 m

The underground sewers are more subjected to________________?


aTensile force


bCompressive force


cBending force


dShearing force


View Answer Compressive force

The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?


a20 m


b30 m


c45 m


d75 m


View Answer 45 m

Facultative bacteria survive in_____________________?


a The presence of oxygen


b The absence of oxygen


c Both cases A. and B.


dNeither A. nor B.



The maximum diameter of sewers adopted in the designs is_______________?


a1.0 m


b 2.0 m


c 3.0 m


d4.0 m


View Answer 3.0 m

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