Civil Engineering MCQs

Page No. 49

Skimming tanks are__________________?


aUsed to remove the grease and oil


bThose from which sludge is skimmed out


cTanks provided with self- cleansing screens


dImproved version of grit chambers



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


aBazin


b Crimp and Bruges


cWilliam-Hazen


dKutter


View Answer Crimp and Bruges

The sewer which resists sulphide corrosion, is____________________?


aBrick sewer


bCast iron sewer


cR.C.C. sewer


dLead sewer


View Answer Lead sewer

Pick up the correct statement from the following ?


aRate of digestion of sludge is more at higher temperature


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


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


dAll the above


View Answer All the above

The rainfall at any place may be determined by__________________?


a Its intensity


b Its direction


cIts frequency


d All the above


View Answer All the above

Pick up the correct statement from the following?


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


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


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


dAll the above


View Answer All the above

The sludge does not contain waste water from_________________?


aBath rooms


bWash basins


cKitchen sinks


dToilets


View Answer Toilets

R.M.O. expenses include___________________?


aRunning expenses


bMaintenance expenses


cOperation expenses


dAll the above


View Answer All the above

1000 kg of sewage contains________________?


a 0.112 kg in suspension


b0.112 kg in solution


c0.225 kg in solution


d Both A. and C. of above



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


aA sedimentation tank and an activated sludge treatment plant


bA plant consisting of Imhoff tanks with low rate trickling filters


cSedimentation tanks with high rate trickling filters


dNone of these



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