GATE XE branch:xe PYQs & Answers — Page 120

Questions 1191–1200 of 1772. Imported answers require independent review unless marked reviewed.

Match the polymers in Column A with their corresponding polymerization methods in Column B.

Column A	Column B
P — Bisphenol A polycarbonate	1 — Cationic
Q — Polyethylene	2 — Step-growth
R — Poly(styrene-b-butadiene)	3 — Coordination
S — Butyl rubber	4 — Anionic

Your answerChoose one option.

P-3, Q-2, R-4, S-1

P-4, Q-3, R-2, S-1

P-2, Q-3, R-4, S-1

P-1, Q-3, R-4, S-2

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Match the appropriate process technique in Column A to fabricate the product in Column B.

Column A	Column B
P — Blow molding	1 — Plastic buckets
Q — Rotational molding	2 — PVC sheet
R — Injection molding	3 — Basket ball
S — Calendering	4 — Plastic bottles

Your answerChoose one option.

P-2, Q-3, R-4, S-1

P-3, Q-4, R-2, S-1

P-4, Q-2, R-1, S-3

P-4, Q-3, R-1, S-2

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Match the appropriate characterization technique in Column A used to determine the polymer attributes in Column B

Column A: P Gel permeation chromatography; Q FT-IR spectroscopy; R Differential scanning calorimetry; S X-ray diffraction.

Column B: 1 Functional group; 2 Crystal structure; 3 Glass transition temperature; 4 Molecular weight

Your answerChoose one option.

P-2, Q-3, R-4, S-1

P-3, Q-4, R-1, S-2

P-2, Q-4, R-1, S-3

P-4, Q-1, R-3, S-2

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Match each additive in Column A with its function given in Column B

Column A: P Azodiformamide; Q Di-octyl phthalate; R Benzoyl peroxide; S 2-(2′-hydroxy phenyl)benzotriazole.

Column B: 1 Curing agent; 2 UV stabilizer; 3 Blowing agent; 4 Plasticizer

Your answerChoose one option.

P-2, Q-3, R-1, S-2

P-3, Q-4, R-1, S-2

P-4, Q-3, R-2, S-1

P-1, Q-3, R-4, S-2

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Plot of shear stress against shear rate for various types of fluids is given below. The appropriate assignment for P, Q, R and S is

Diagram for Engineering Sciences question 14

Your answerChoose one option.

P-Dilatant, Q-Bingham plastic, R-Pseudoplastic, S-Newtonian

P-Bingham plastic, Q-Pseudoplastic, R-Dilatant, S-Newtonian

P-Pseudoplastic, Q-Bingham plastic, R-Newtonian, S-Dilatant

P-Newtonian, Q-Dilatant, R-Pseudoplastic, S-Bingham plastic

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The number average molecular weight of a polyester formed from equimolar mixture of adipic acid and ethylene glycol at a conversion of 99.5% will be ______ (round off to nearest integer).

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For a freely jointed linear polyethylene chain with molar mass of 1.4×10⁵ g mol⁻¹, the value of root mean square end-to-end distance in nanometer is ______ (round off to 1 decimal place). [Given: C-C bond length = 0.154 nanometer]

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Viscosity measurements were performed for a set of PMMA solutions of different concentrations in toluene at 25 °C. The plot of reduced viscosity against concentration (c) of the PMMA solutions produced an intercept of 21.0 cm³ g⁻¹ on the ordinate at c = 0. The value of viscosity average molecular weight of PMMA in toluene at 25 °C is ______ (round off to nearest integer). [Given: Mark-Houwink constants K = 7.5×10⁻³ cm³ g⁻¹ and a = 0.72 for PMMA in toluene at 25 °C]

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Glass fibre reinforced PP composite is to be prepared with 20 volume % of glass fibre. The densities of glass fibre and PP are 2540 kg m⁻³ and 900 kg m⁻³, respectively. The mass of glass fibre required to produce 1 kg of the composite in kg is ______ (round off to 2 decimal places).

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A polymer solution flows through a cylindrical tube with a diameter of 4 mm at a volumetric flow rate of 10⁻⁹ m³ s⁻¹. Under laminar flow condition and assuming the polymer solution to be a Newtonian fluid with viscosity 10² N s m⁻², the value of pressure drop per unit length of the tube in N m⁻³ is ______ (round off to nearest integer). [Consider the value of π as 3.14]

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GATE XE branch:xe PYQs

Question 10

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Question 15

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Question 19