Chemical Engineering MCQs

Page No. 342

Viscosity of a polymer solution or melt _________________?


aDecreases with increase in molecular weight

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bDecreases with increase in temperature

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cIncreases with increase in temperature

✓


dDoes not vary with temperature rise

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


aPolymer termination step

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bCondensation of siloxane to silicone

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cInitial hydrolysis of silicone monomer

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dNone of these

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


aHardeners

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bAnti-shrinkage agents

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cPlasticisers

✓


dTransparency improver

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View Answer Plasticisers

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


aIn a chain without the elimination of water

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bWith the elimination of small amount of water

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cOf the same monomer by elimination of small molecules of water

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dNone of these

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Maximum consumption of polymers is in___________________?


aElectrical insulation

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bToys making

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cCoating and films

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dPackaging

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View Answer Coating and films

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


aUnsaturated polyester

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bAlkyd resins

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cSaturated polyester

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dAmino resins

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View Answer Alkyd resins

Addition of stabiliser during PVC manufacture is done to________________?


aImprove its impact strength

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bImprove its elasticity

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cReduce the melt viscosity & glass transition temperature

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dPrevent its thermal degradation

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Amino resins are used in paper treatment to improve its__________________?


aWet tear and bursting strength

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bFolding endurance

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cWet rub resistance

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dAll A., B. & C.

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View Answer All A., B. & C.

Addition polymerisation is not involved in the manufacture of_______________?


aLow density polythene

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bPoly vinyl chloride

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cPolystyrene

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dPolyhexamethylene adipamide

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Nylon-6 as compared to nylon 66 has lower ?


aAbrasion resistance

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bThermal stability

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cAdhesion to rubber

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dHardness

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View Answer Abrasion resistance

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