Chemical Engineering MCQs

Page No. 352

Pick out the wrong statement regarding the solubility characteristics of high polymers?


aGreater the degree of cross-linking in the polymer, lesser is its solubility


bPolymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents


cSwelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent


dHigh molecular weight polymers on dissolving gives solution of very low viscosity



SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?


a1: 3


b3 : 1


c1 : 2


d2 : 1


View Answer 1: 3

A copolymer of vinyl and vinylidene chloride is called_____________________?


aTreylene


bOrlon


cSaran


dDacron


View Answer Saran

Poly-methyl-methacrylate (PMMA) is known as_______________?


aBakelite


bTeflon


cPerspex


dNylon-6


View Answer Perspex

Molecular weights of plastics ranges from_______________?


a1000 to 5000


b5000 to 1000


c20000 to 25000


d109 to 1011


View Answer 20000 to 25000

In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?


aBakelite (phenol formaldehyde)


bPolyester


cPolythene


dNylon-6



Polyvinyl alcohol is used as a___________________?


aCation/anion exchanger


bWater soluble adhesive


cTextile fibre


dNon-sticky coating on frying pans



Caprolactam, a raw material for the manufacture of nylon-6, is produced from_______________?


aPhenol


bNaphthalene


cBenzene


dPyridine


View Answer Benzene

The conversion of caprolactam in the above case is about ____________ percent?


a25


b50


c70


d90


View Answer 90

Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?


aPoor tensile strength


bPoorer resistance


cGreater amount of heat build up heavy loading


dAll A., B. and C.


View Answer All A., B. and C.

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