Chemical Engineering MCQs

Page No. 342

Viscosity of a polymer solution or melt _________________?


aDecreases with increase in molecular weight


bDecreases with increase in temperature


cIncreases with increase in temperature


dDoes not vary with temperature rise



The rate controlling step in the manufacture of silicone rubber is the_________________?


aPolymer termination step


bCondensation of siloxane to silicone


cInitial hydrolysis of silicone monomer


dNone of these



Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as __________________?


aHardeners


bAnti-shrinkage agents


cPlasticisers


dTransparency improver


View Answer Plasticisers

A copolymer is formed by the combination of two or more monomer molecules_________________?


aIn a chain without the elimination of water


bWith the elimination of small amount of water


cOf the same monomer by elimination of small molecules of water


dNone of these



Maximum consumption of polymers is in___________________?


aElectrical insulation


bToys making


cCoating and films


dPackaging


View Answer Coating and films

______________are produced by reacting polybasic acid (e.g. Phthalic anhydride) with polyhydric alcohol (e.g., glycerol) ?


aUnsaturated polyester


bAlkyd resins


cSaturated polyester


dAmino resins


View Answer Alkyd resins

Addition of stabiliser during PVC manufacture is done to________________?


aImprove its impact strength


bImprove its elasticity


cReduce the melt viscosity & glass transition temperature


dPrevent its thermal degradation



Amino resins are used in paper treatment to improve its__________________?


aWet tear and bursting strength


bFolding endurance


cWet rub resistance


dAll A., B. & C.


View Answer All A., B. & C.

Addition polymerisation is not involved in the manufacture of_______________?


aLow density polythene


bPoly vinyl chloride


cPolystyrene


dPolyhexamethylene adipamide



Nylon-6 as compared to nylon 66 has lower ?


aAbrasion resistance


bThermal stability


cAdhesion to rubber


dHardness


View Answer Abrasion resistance

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