Civil Engineering MCQs

Page No. 38

With self cleansing velocity in sewers___________________?


aSilting occurs at bottom


bScouring occurs at bottom


cBoth silting and scouring occur at bottom


dNeither silting nor scouring occurs at bottom



The ratio of depths at partial flo________________?


a 1 –


b 1 –


c ½ (1 –


d ½ (1 –


View Answer ½ (1 –

If the grit in grit chambers is 4.5 million litres per day, its cleaning is done____________________?


aManually


bMechanically


cHydraulically


dElectrically


View Answer Manually

The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?


a 20 cm


b25 cm


c40 cm


d50 cm


View Answer 50 cm

Oxidation process results in the formation of___________________?


aCarbon dioxide


bNitrates


cSulphates


dAll the above


View Answer All the above

The sewerage system consists of______________________?


aHouse sewer


bLateral sewer


cBranch sewer


dAll of these


View Answer All of these

The minimum diameter of sewer to be adopted is_________________?


a10 cm


b12.5 cm


c15 cm


d25 cm


View Answer 15 cm

The porosity of sediments in sewer pipes, is usually taken as___________________?


a0.010


b0.011


c 0.012


d0.013


View Answer 0.013

The presence of free ammonia in sewage, is detected by___________________?


aBoiling


bAdding potassium permanganate


cAdding sulphuric acid


dPhenol-di-sulphuric acid


View Answer Boiling

The digested sludge from septic tanks, is removed after a maximum period of__________________?


a3 years


b3.5 years


c4 years


d 5 years


View Answer 3 years

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