Civil Engineering MCQs

Page No. 49

Skimming tanks are__________________?


aUsed to remove the grease and oil

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bThose from which sludge is skimmed out

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cTanks provided with self- cleansing screens

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dImproved version of grit chambers

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The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by______________________?


aBazin

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b Crimp and Bruges

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cWilliam-Hazen

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dKutter

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View Answer Crimp and Bruges

The sewer which resists sulphide corrosion, is____________________?


aBrick sewer

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bCast iron sewer

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cR.C.C. sewer

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dLead sewer

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View Answer Lead sewer

Pick up the correct statement from the following ?


aRate of digestion of sludge is more at higher temperature

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bThermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C

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cMesophilic organisms digest the sludge if the temperature is between 25° and 40°C

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dAll the above

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View Answer All the above

The rainfall at any place may be determined by__________________?


a Its intensity

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b Its direction

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cIts frequency

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d All the above

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View Answer All the above

Pick up the correct statement from the following?


aHydrogen sulphide gas in excess, may cause corrosion of concrete sewers

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b4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river

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cSolubility of oxygen in sewage is 95% of that of distilled water

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dAll the above

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View Answer All the above

The sludge does not contain waste water from_________________?


aBath rooms

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bWash basins

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cKitchen sinks

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dToilets

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View Answer Toilets

R.M.O. expenses include___________________?


aRunning expenses

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bMaintenance expenses

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cOperation expenses

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dAll the above

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View Answer All the above

1000 kg of sewage contains________________?


a 0.112 kg in suspension

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b0.112 kg in solution

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c0.225 kg in solution

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d Both A. and C. of above

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For treating the sewage of a large city, you will recommend_________________?


aA sedimentation tank and an activated sludge treatment plant

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bA plant consisting of Imhoff tanks with low rate trickling filters

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cSedimentation tanks with high rate trickling filters

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dNone of these

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