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]

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bVs = 418 (Gs – Gw)d² [(3T + 70)/100]

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cVs = 218 (Gs – Gw)d² [(3T + 70)/100]

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dVs = 218 (Gs – Gw)d [(3T + 70)/100]

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In the activated sludge process__________________?


aAeration is continued till stability

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b Aeration is done with an admixture of previously aerated sludge

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cSludge is activated by constant stirring

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dWater is removed by centrifugal action

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


ad/D = ½ (1 – –

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ba/A

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c r/R = [1 –

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dAll the above

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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

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b1.49 m

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c1.59 m

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d1.69 m

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View Answer 1.69 m

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


aWith beds of rocks and gravels

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bLined with stones

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


a2 days

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b7 days

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c12 days

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d14 days

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View Answer 14 days

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


a30 to 40%

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b40 to 60%

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c 60 to 80%

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d 80 to 90%

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View Answer 60 to 80%

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


a10 days

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b20 days

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c30 days

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d60 days

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View Answer 30 days

are available in size Stoneware sewers________________?


a10 cm

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b15 cm

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c20 cm

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dAll the above

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View Answer All the above

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


aOxygen

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bNitrogen

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cHydrogen

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dCarbon dioxide

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View Answer Carbon dioxide

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