Civil Engineering MCQs

Page No. 25

In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?


a Combined system


b Partially separate system


cSeparate system


dNone of these


View Answer Separate system

Dried sewage after treatment is used as____________________?


aFertilizer


bBuilding material


cChemical for lowering B.O.D.


dBase material for paints


View Answer Fertilizer

In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?


a Separate system


bCombined system


cPartially combined system


dNone of these


View Answer Combined system

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?


a 0°C


b15°C


c20°C


d25°C


View Answer 20°C

Pick up the in-correct statement from the following?


aManholes are provided in sewer pipes at suitable intervals


b Catch basins are generally provided in sewers for carrying drainage discharge


c Inlets are generally provided in all sewers


dNone of these



The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?


a25 %


b50 %


c10 %


d5 %


View Answer 50 %

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?


a Initial demand


bFirst stage demand


cCarbonaceous demand


dAll of these


View Answer All of these

If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?


a 1.250 D


b1.350 D


c1.425 D


d 1.625 D


View Answer 1.625 D

For evaporation and measurement of settable solids, the apparatus used, is________________?


aA jar


b A breaker


cA test tube


dAn Imhoff cone


View Answer An Imhoff cone

For design of sewers, percentage of sewage discharge is assumed_____________________?


a65 to 70%


b70 to 75%


c75 to 80%


d85%


View Answer 75 to 80%

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