GATE XE kind:question PYQs & Answers — Page 12

Questions 111–120 of 1772. Imported answers require independent review unless marked reviewed.

The stress-strain profiles in the figure were obtained following longitudinal tensile loading for a brittle polymer, glass fibre, and a composite lamina consisting of unidirectional continuous glass fibres and the polymer matrix. Assume that the matrix is free of voids, there is perfect bonding between glass fibres and the matrix, and there are no residual stresses in the composite lamina.

Diagram for Engineering Sciences question 111

Identify the correct stress-strain profile for the polymer matrix, glass fibre, and their composite lamina from the above figure.

Your answerChoose one option.

P – Matrix ; Q – Glass fibre ; R – Composite

P – Glass fibre ; Q – Composite ; R – Matrix

P – Glass fibre ; Q – Matrix ; R – Composite

P – Composite ; Q – Glass fibre ; R – Matrix

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Norrish-Smith effect or Trommsdorff effect during free radical bulk polymerization at high conversion is characterized by________________.

Your answerChoose one option.

increase in rate of polymerization with time due to increase in viscosity

decrease in rate of polymerization with time due to increase in viscosity

decrease in rate of polymerization with time due to reduction in viscosity

increase in rate of polymerization with time due to reduction in viscosity

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For a polydisperse polymer, the viscosity-average molecular weight (

) becomes equal to the weight-average molecular weight (

), when the Mark–Houwink constant a is _________________.

Your answerChoose one option.

0.1

0.5

0.7

1.0

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Which one of the following is NOT a rotational rheometer?

Your answerChoose one option.

Cone and plate rheometer

Parallel plate rheometer

Capillary rheometer

Cylindrical Couette rheometer

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Select the correct option to match the Product with the most appropriate Processing technique from the table given below:

Product		Processing technique
P	Fibre-reinforced pressure vessel	I	Rotomoulding
Q	Overhead water tank	II	Thermoforming
R	Blister package for medicine	III	Filament winding
S	Plastic carry bag	IV	Blown film extrusion

Your answerChoose one option.

P–III ; Q–II ; R–I ; S–IV

P–IV ; Q–III ; R–II ; S–I

P–II ; Q–I ; R–III ; S–IV

P–III ; Q–I ; R–II ; S–IV

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Which of the following is/are the most appropriate compatibilizer(s) for the polypropylene/Nylon 6 blend?

Your answerSelect all correct options. You can choose more than one.

Maleic anhydride grafted polystyrene

Maleic anhydride grafted polypropylene

Polypropylene-b-polystyrene

Glycidyl methacrylate grafted polypropylene

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Which of the following polymers is/are prone to hydrolytic degradation?

Your answerSelect all correct options. You can choose more than one.

Poly(ethylene terephthalate)

Polypropylene

Poly(lactic acid)

Polycaprolactone

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An insulating polymer is used as a dielectric medium between two capacitor plates. The dielectric constant of the polymer is 5.0 and the permittivity of vacuum is

F/m. The permittivity of the polymer is ______________ ×

F/m (rounded off to two decimal places).

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Select the correct option to match the Polymer to its Major polymeric constituent from the table given below:

Polymer		Major polymeric constituent
P	Natural rubber	I	Polyisobutylene
Q	Gutta percha	II	Polychloroprene
R	Neoprene	III	trans-1,4-polyisoprene
S	Butyl rubber	IV	cis-1,4-polyisoprene

Your answerChoose one option.

P–IV ; Q–III ; R–I ; S–II

P–IV ; Q–III ; R–II ; S–I

P–II ; Q–IV ; R–I ; S–III

P–II ; Q–IV ; R–III ; S–I

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Resol is produced by reaction of ____________________.

Your answerChoose one option.

phenol with an excess of formaldehyde in presence of a base catalyst

formaldehyde with an excess of phenol in presence of a base catalyst

phenol with an excess of formaldehyde in presence of an acid catalyst

an equimolar mixture of phenol and formaldehyde at neutral pH

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GATE XE kind:question PYQs

Question 111

Question 112

Question 113

Question 114

Question 115

Question 116

Question 117

Question 118

Question 119

Question 120