Chemical Engineering MCQs

Page No. 739

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to___________________?


aAvoid mechanical weakening of fibre

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bRemove lignin by way of crystallisation

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cIncrease the cellulose content

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dNone of these

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Main product in calcium carbide-water reaction is___________________?


aCa(OH)2

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bC2H2

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cCO2

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dCaCO3

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View Answer C2H2

The yield of tar from high temperature carbonisation of dry coal is about _______________ percent?


a3

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b12

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c22

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d0.3

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View Answer 3

Permanent hardness of water can be removed by____________________?


aSimply boiling

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bAdding alum

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cPassing it through cation & anion exchangers

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dAll (A), B. and (C)

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Bitterns is a/an_________________?


aUnsaturated fat

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bStarting material for the production of iodine

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cBy-product of chlor-alkali industry

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dNone of these

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View Answer None of these

Nylon-66 is so named because the____________________?


aAverage degree of polymerisation of the polymer is 1966

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bNumber of carbon atoms between two nitrogen atoms are 6

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cNumber of nitrogen atoms between two carbon atoms are 6

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dPolymer was first synthesised in 1966

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Salt is added in the kettle during soap manufacture to separate ___________________?


aSoap from lye

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bGlycerine from lye

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cThe metallic soap

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dThe unsaponified fat from soap

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View Answer Soap from lye

Percentage of alcohol in beer may be around ______________________ percent?


a2-8

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b18-23

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c27-32

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d1-4

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View Answer 2-8

Fatty material used in soap making is _______________________?


aFatty acid

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bFatty alcohols

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cTallow

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dDetergents

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View Answer Tallow

The main use of activated carbon in water treatment is to control ___________________?


aBacterial growth

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bTaste and odour

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cTurbidity

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dNone of these

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View Answer Taste and odour

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