Chemical Engineering MCQs

Page No. 333

Polycondensation reaction of polymerisation ___________________?


aDoes not produce linear polymers

✖


bProduces only thermoplastic material

✖


cProduces epoxy polymers

✓


dDoes not need any catalyst

✖



In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is________________?


aTerylene

✓


bPolybutadiene

✖


cPVC

✖


dPolypropylene

✖


View Answer Terylene

In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?


aPTFE

✖


bBuna-S

✓


cPMMA

✖


dPolycaprolactam

✖


View Answer Buna-S

Properties of a polymer is affected by the____________________?


aChain length

✖


bIntermolecular forces

✖


cBoth A. and B.

✓


dNone of these

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View Answer Both A. and B.

Nylon-66 is manufactured from ____________________?


aAdipic acid and Hexamethylene diamine

✓


bCaprolactam

✖


cMaleic anhydride and Hexamethylene diamine

✖


dDimethyl terephthalate (DMT) and ethylene glycol

✖



Poly-tetra-fluoro ethylene (PTFE) is known as_________________?


aDacron

✖


bTeflon

✓


cBakelite

✖


dBakelite

✖


View Answer Teflon

Density of low density polythene is about ____________ gm/c.c?


a0.38

✖


b0.56

✖


c0.81

✖


d0.91

✓


View Answer 0.91

Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6?


a-20 to 25

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b50 to 75

✖


c100 to 150

✖


d250-280

✓


View Answer 250-280

Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?


aImproving the stretchability

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bDyeing/colouring

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cDetergent solution washing

✓


dGlycol soaking

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In condensation polymerisation as compared to addition polymerisation____________________?


aThe monomers are unsaturated compounds

✖


bNo co-product is lost

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cThe monomers contain two functional groups

✓


dGenerally only one monomer is involved

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