Chemical Engineering MCQs

Page No. 325

_____________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate?


aFibrous

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bFibrous

✓


cRubbery

✖


dHard

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View Answer Fibrous

Benzoyl chloride is not used as a catalyst in the manufacture of___________________?


aPolystyrene

✖


bPolyvinyl acetate

✖


cPolypropylene

✓


dPolyvinyl chloride-co-vinyl acetate

✖


View Answer Polypropylene

Visco-elastic behaviour exhibited by plastics is a ______________ like behaviour?


aSolid

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bLiquid

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cCombination of solid & liquid

✓


dNeither solid nor liquid

✖



Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?


a50000

✓


b51600

✖


c49200

✖


d50800

✖


View Answer 50000

_____________ tubes are good substitute for human blood vessels on heart by-pass operation?


aPVC

✖


bPolythene

✖


cTeflon/Dacron

✓


dPolystyrene

✖


View Answer Teflon/Dacron

Vulcanisation of rubber_____________________?


aDecreases its tensile strength

✖


bIncreases its ozone & oxygen reactivity

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cIncreases its oil & solvent resistance

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dConverts its plasticity into elasticity

✓



Trade name of ______________ is neoprene?


aPolychlorophrene

✓


bPolyisoprene

✖


cPolytetrafluoroethylene

✖


dPoly vinyl acetate

✖


View Answer Polychlorophrene

Which of the following low molecular weight (<104), soft & waxy polymer is used in „chewing gum‟ ?


aCellulose acetate

✖


bPolyvinyl acetate

✓


cThiokol

✖


dPVC

✖


View Answer Polyvinyl acetate

Dacron is a/an___________________?


aAddition polymer

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bCondensation polymer

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cPolyester

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dBoth B. and C.

✓


View Answer Both B. and C.

Dacron (or Treylene) fibres as compared to nylon fibres have_____________________?


aBetter heat & acid resistant properties

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bPoorer resistance to alkalis

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cPoorer dyeability

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dAll A., B. and C.

✓


View Answer All A., B. and C.

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