Chemical Engineering MCQs

Page No. 714

Bleaching of paper pulp is done with__________________?


aActivated clay


bBromine


cChlorine or chlorine dioxide


dMagnesium sulphite



Concentration of sulphide ores is done usually by____________________?


aRoasting


bSmelting


cFroth floatation


dElectromagnetic separation


View Answer Froth floatation

Diaphragm electrolytic cell as compared to mercury electrolytic cell_____________________?


aProduces 70% NaOH solution


bRequires less specific power consumption for the production of chlorine


cRequires lesser investment for similar capacity


dAll A , B. and C



Pick out the wrong statement ?


aStrongly caking coal should not be used in the Lurgi gasifier


bAcetylene gas cannot be used for illumination purpose


cWater gas is called blue gas because of the color of the flame, when it is burnt


dGaseous fuels require less percentage of excess air for combustion as compared to liquid fuels



Pick out the false statement pertaining to water treatment ?


aAeration of water is effective in CO2 removal


bThe zeolite water softening process reduces the hardness of water by not more than 50%


cSodium sulphate or sodium carbonate do not cause hardness in water


dWater with pH value less than 7, is acidic



Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is___________________?


a0.14


b0.34


c0.94


d1.4


View Answer 0.94

Wood charcoal is used for decolouration of sugar, because it _______________ the coloured materials?


aAdsorbs


bOxidises


cReduces


dConverts


View Answer Adsorbs

Massecuite is a terminology used in the ______________ industry ?


aPaint


bOil hydrogenation


cSoap


dSugar


View Answer Sugar

Pick out the true statement pertaining to water treatment ?


aSlow sand filters can remove colour completely


bActivated carbon can be used for taste & odour control without subsequent filtration


cApplication of activated carbon reduces the temporary hardness of water


dNormally, the turbidity is removed by adding a coagulant prior to sedimentation



Pick out the wrong statement ?


aKraft method of pulp manufacture can process all types of fibrous raw materials


bDigestion time for bagasse is less than that for wood base materials


cBoth temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method


dNone of these


View Answer None of these

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