Chemical Engineering MCQs

Page No. 334

Polyvinyl acetate is never used for making_________________?


aMoulded articles

✓


bFibres

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cAdhesives

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dAll A., B. & C.

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View Answer Moulded articles

Thermosetting resins/polymers as compared to thermoplastic ones are ____________________?


aSoluble in all organic solvents

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bMore brittle

✓


cFormed by addition polymerisation only

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dEasily reshaped & reused

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View Answer More brittle

Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ?


aPerspex

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bLucite

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cPlexiglass

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dTeflon

✓


View Answer Teflon

In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the _____________ fibres?


aViscose rayon

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bAcrylic

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cPolyvinyl acetate

✖


dSaturated polyester

✓


View Answer Saturated polyester

Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the ___________________?


aElectrical insulation purpose

✖


bTanning of leather

✖


cStrengthening of plaster of Paris

✓


dDecorative laminates

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Thermal pyrolysis of ethylene dichloride produces ____________________?


aTrichloroethylene

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bVinyl chloride

✓


cEthanol amine

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dEthylene oxide

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View Answer Vinyl chloride

In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher ___________________?


aDensities

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bMelting point

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cTensile strength

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dHardness, rigidity & brittleness

✓



Catalyst used in the production of high density polythene by low pressure Ziegler process is ____________________?


aAluminium triethyl activated with TiCl4

✓


bPlatinum

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cMolybdenum

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dNickel

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Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is__________________?


a7 kgf/cm2 and 70 °C

✓


b1000 kgf/cm2 and 100°C

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c7 kgf/cm2 and 700°C

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d1 kgf/cm2 (gage) and 70°C

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View Answer 7 kgf/cm2 and 70 °C

Elastomers are__________________?


aThermosetting material

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bExemplified by protein derivatives

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cHaving high flexural strength

✓


dHaving very high tensile strength and heat resistance

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