Civil Engineering MCQs

2965 MCQs (Page 287 of 297)

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

A. D/d = ½ (1 – –
B. A/a
C. R/r = [1 –
D. All the above

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In the activated sludge process__________________?

A. Aeration is continued till stability
B. Aeration is done with an admixture of previously aerated sludge
C. Sludge is activated by constant stirring
D. Water is removed by centrifugal action

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

A. Vs = 418 (gs – gw) d [(3t + 70)/100]
B. Vs = 418 (gs – gw)d² [(3t + 70)/100]
C. Vs = 218 (gs – gw)d² [(3t + 70)/100]
D. Vs = 218 (gs – gw)d [(3t + 70)/100]

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A well oxidized sewage contains nitrogen mainly as___________________?

A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these

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

A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide

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are available in size Stoneware sewers________________?

A. 10 cm
B. 15 cm
C. 20 cm
D. All the above

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

A. 10 days
B. 20 days
C. 30 days
D. 60 days

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

A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 80 to 90%

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Hume steel pipes are__________________?

A. Steel pipes
B. Steel shell coated from inside with cement mortar
C. Steel shell coated from outside with cement mortar
D. Both b. and c.

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If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?

A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours

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