Chemical Engineering MCQs

Page No. 344

Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________?


a50°C and 3 – 4 kg/cm2


b50°C and 1 kgf/cm2


c250°C and 10 kgf/cm2


d250°C and 1 kgf/cm2



Glyptal used in the manufacture of paints & lacquers is a _____________ polymer?


aPolyamide


bPolystyrene


cPolyester


dPolyacrylonitrile


View Answer Polyester

Main constituent of cotton fiber is __________________?


aLignin


bCellulose


cStarch


dGelatine


View Answer Cellulose

Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from ______________ resins?


aEpoxy


bPhenol formaldehyde


cUrea formaldehyde


dMelamine formaldehyde


View Answer Urea formaldehyde

Thermoplastic resins usually____________________?


aRemain hard as long as they are hot


bCannot be reclaimed from waste


cPermanent setting resins


dLess brittle than thermosetting resins



Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer ______________ properties?


aThermoplastic


bThermosetting


cElastometric


dBrittleness


View Answer Elastometric

Low pressure Zeigler process of polythene manufacture____________________?


aEmploys a pressure of 30 kgf/cm2


bAchieves an yield of 95-98% based on ethylene


cProduces very low density polythene


dDoes not use any catalyst for polymerisation



_______________ practically possess no elasticity?


aVulcanite or ebonite


bSpandex fibre


cPolysulphide rubber


dPolysulphide rubber


View Answer Vulcanite or ebonite

Buna-S is a _______________ material?


aFibrous


bPlastic


cResinous


dRubbery


View Answer Rubbery

Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ?


aStarch


bCellulose


cProteins


dNucleic acids


View Answer Proteins

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