Chemical Engineering MCQs

Page No. 335

The generic chemical name for the class of polymers which are commercially known as nylons is______________________?


aPolyolefins


bPolyamide


cPolyacrylate


dPolyurethane


View Answer Polyamide

Phthalic anhydride is used___________________?


aIn making PVC


bAs plasticisers


cIn insecticides manufacture


dFor making nylon-6


View Answer As plasticisers

The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is____________________?


aPolyvinyl alcohol


bPolyvinyl acetate


cPolyvinyl butyral


dPVC


View Answer Polyvinyl butyral

Polycaprolactam is also known as _________________?


aNylon-66


bNylon-6


cTeflon


dSBR


View Answer Nylon-6

Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the _____________ fibres?


aAcrylic


bPolyester


cNylon 6:6


dPolypropylene


View Answer Acrylic

Flexible foam (for mattresses) are usually made of _________________?


aPVC


bSilicone rubber


cPolyurethanes


dPolyamides


View Answer Polyurethanes

Which of the following is not a natural polymer ?


aNucleic acids e.g. RNA and DNA


bPolysaccharides


cPolyisoprene


dPolyurethane


View Answer Polyurethane

Which of the following is a natural polyamide fiber?


aWool


bSilk


cCotton


dNone of these


View Answer Wool

Synthetic rubber___________________?


aDeforms, if stretched to double of its original dimension


bIs brittle at low temperature


cIs softer at higher temperature


dIs highly permeable to air & water and is readily attacked by chemicals & atmospheric gases



_______________ is a natural fiber?


aCellulose


bDacron


cNylon-6


dNone of these


View Answer Cellulose

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