Civil Engineering MCQs

Page No. 24

Sewer ventilating columns are generally placed at_______________?


aDistances 150 m to 300 m

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bUpper ends of branch sewers

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c Every change in the size of sewers

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d All the above

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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)

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bQ/(L × D)

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cQ/L

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dQ/(B × L)

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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.)

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b Dissolved Oxygen (D.O.)

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cChemical Oxygen Demand (C.O.D.)

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dNone of these

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Water content of sewage is about___________________?


a90 %

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b 95 %

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c99 %

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d 9.9 %

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View Answer 9.9 %

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


aParabolic

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bCircular

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cRectangular

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dNew egged

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View Answer Circular

The factor responsible for purification of sewage in river is________________?


aHydrology

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bDissolved oxygen in water

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cTemperature

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dAll the above

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View Answer All the above

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


a 45 %

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b50 %

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c55 %

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d60 %

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View Answer 55 %

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


aImhoff Cone

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bTurbid meter

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cPotentiometer

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dNone of these

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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

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

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

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

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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

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

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cThe minimum width of septic level is 90 cm

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dThe depth of tank is kept equal to its width

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