Chemical Engineering MCQs

Page No. 67

Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called_________________?


aFumes


bMists


cSmoke


d Aerosols


View Answer Aerosols

The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?


aAnaerobic


b Saprophytic


c Aerobic


dParasitic


View Answer Aerobic

Presence of _____________ hardness is responsible for the temporary hardness in water?


a Carbonate


bCalcium


c Chloride


dSulphate


View Answer Calcium

Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?


aInversely proportional to viscosity of gas


bProportional to the viscosity & density of the gas


cProportional to the pressure of the gas


dBoth B. and C.


View Answer Both B. and C.

Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?


aReduce SO2 content in


b Catalytically convert SO2 to SO3 in


c Increase the dew point of


dNone of these


View Answer Reduce SO2 content in

The main industrial source of emission of hydrogen sulphide air pollutant is________________?


aPetroleum refineries


bCoal based thermal power plants


cPulp and paper plant


dMetallurgical roasting & smelting plant



Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?


a Natural aeration of water stream


bPhotosynthetic action of algae


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________?


aFading of dyes on textiles


b Corrosion, tarnishing & soiling of metals


cReduced strength of textiles


dAll A., B. and C.


View Answer All A., B. and C.

Tri-sodium phosphate is used in boiler water treatment to reduce____________________?


aTurbidity


bCaustic embrittlement


cSuspended silica


dDissolved oxygen


View Answer Caustic embrittlement

Which of the following is the most major constituents of air pollutants ?


aOxides of sulphur


bOxides of nitrogen


c Carbon monoxide


dHydrogen sulphide


View Answer Oxides of sulphur

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