Chemical Engineering MCQs

Page No. 325

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


aFibrous


bFibrous


cRubbery


dHard


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


bLiquid


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


cIncreases its oil & solvent resistance


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


bCondensation polymer


cPolyester


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


bPoorer resistance to alkalis


cPoorer dyeability


dAll A., B. and C.


View Answer All A., B. and C.

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