Civil Engineering MCQs

Page No. 24

Sewer ventilating columns are generally placed at_______________?


aDistances 150 m to 300 m


bUpper ends of branch sewers


c Every change in the size of sewers


d All the above


View Answer All the above

In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?


aQ/(B × D)


bQ/(L × D)


cQ/L


dQ/(B × L)


View Answer Q/(B × L)

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?


aBio-Chemical Oxygen Demand (B.O.D.)


b Dissolved Oxygen (D.O.)


cChemical Oxygen Demand (C.O.D.)


dNone of these



Water content of sewage is about___________________?


a90 %


b 95 %


c99 %


d 9.9 %


View Answer 9.9 %

The most efficient cross-section of sewers in a combined sewerage system is________________?


aParabolic


bCircular


cRectangular


dNew egged


View Answer Circular

The factor responsible for purification of sewage in river is________________?


aHydrology


bDissolved oxygen in water


cTemperature


dAll the above


View Answer All the above

To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?


a 45 %


b50 %


c55 %


d60 %


View Answer 55 %

The pH value of sewage is determined with the help of_________________?


aImhoff Cone


bTurbid meter


cPotentiometer


dNone of these


View Answer Potentiometer

The normal value of over flow rates for plain primary 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


d80,000 to 100,000 litres/sqm/day



Which one of the following statements regarding septic tanks is wrong ?


a A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided


bThe outlet invert level is kept 5 to 7.5 cm below the inlet invert level


cThe minimum width of septic level is 90 cm


dThe depth of tank is kept equal to its width



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