Civil Engineering MCQs

Page No. 47

The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is__________________?


aVs = 418 (Gs – Gw) d [(3T + 70)/100]


bVs = 418 (Gs – Gw)d² [(3T + 70)/100]


cVs = 218 (Gs – Gw)d² [(3T + 70)/100]


dVs = 218 (Gs – Gw)d [(3T + 70)/100]



In the activated sludge process__________________?


aAeration is continued till stability


b Aeration is done with an admixture of previously aerated sludge


cSludge is activated by constant stirring


dWater is removed by centrifugal action



running partially full with central angle , For a circular sewer of diameter__________________?


ad/D = ½ (1 – –


ba/A


c r/R = [1 –


dAll the above


View Answer All the above

If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?


a1.39 m


b1.49 m


c1.59 m


d1.69 m


View Answer 1.69 m

Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?


aWith beds of rocks and gravels


bLined with stones


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

The grit chambers of sewage treatment plants, are generally cleaned after__________________?


a2 days


b7 days


c12 days


d14 days


View Answer 14 days

In trickling filter, B.O.D. is reduced to___________________?


a30 to 40%


b40 to 60%


c 60 to 80%


d 80 to 90%


View Answer 60 to 80%

In normal conditions, the period for sludge digestion, is_______________?


a10 days


b20 days


c30 days


d60 days


View Answer 30 days

are available in size Stoneware sewers________________?


a10 cm


b15 cm


c20 cm


dAll the above


View Answer All the above

In a sludge tank, the gas mainly produced, is_________________?


aOxygen


bNitrogen


cHydrogen


dCarbon dioxide


View Answer Carbon dioxide

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