Engineering Sciences
GATE XE discipline:engineering-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 661–670 of 1772. Imported answers require independent review unless marked reviewed.
Question 114
Open questionXE-FMCQ1 markNeeds review
A high molecular weight polymer passes through different zones from the hopper to the die in an extruder. Among the options given, identify the correct match between the zones and their key functions.
Zones: P — Metering zone; Q — Compression zone; R — Feed zone; S — Working zone.
Key functions: 1 — High shear forces for effective mixing; 2 — Receives the charge or feed; 3 — Melts the charge or feed through heat conducted by the heating element; 4 — The charge or feed acquires a constant flow rate imparted by the helical flight of the screw.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 115
Open questionXE-FMCQ1 markNeeds review
Polymer wetting is improved by the addition of fillers with functional groups. In a typical case-study, natural-clay was modified with hydroxyl groups and compounded with Nylon 6 along with an antioxidant. The resulting composite exhibited poor mechanical properties. Which one among the options given explains this observation?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 116
Open questionXE-FMCQ1 markNeeds review
Among the options given, identify the correct match between the polymers and their glass transition temperatures (T_g).
Polymer: P — High density polyethylene; Q — Poly(vinyl carbazole); R — Polymethyl methacrylate; S — Polycarbonate.
Glass transition temperature (°C): 1 — >200; 2 — 145 to 155; 3 — -100 to -80; 4 — 90 to 100.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 117
Open questionXE-FMCQ1 markNeeds review
What is the correct order of decreasing crystallinity of the given polymers?
P — atactic-Polypropylene; Q — syndiotactic-Polystyrene; R — Nylon 6; S — Polyethylene terephthalate
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 118
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Choose the correct option that best correlates the graphs with the polymerization methods.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 119
Open questionXE-FMSQ2 marksNeeds review
From the options given, identify the correct match(es) between the polymer products with the most appropriate processing technique.
Polymer product: P — Fishing rods; Q — Soft drink bottles; R — Plastic sheets; S — Plastic trays.
Processing technique: 1 — Compression moulding; 2 — Thermoforming; 3 — Pultrusion; 4 — Blow moulding.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 120
Open questionXE-FMSQ2 marksNeeds review
Among the options given, which agents are used to vulcanize or cure rubbers?
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Open questionXE-FMSQ2 marksNeeds review
Lipase is a natural enzyme, which cleaves carboxylic ester bonds. Among the options given, identify the polymer(s) degraded by lipase.
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Open questionXE-FMSQ2 marksNeeds review
Among the options given, identify the correct pair(s) of catalyst and co-catalyst that form a Ziegler-Natta catalyst.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 123
Open questionXE-FMSQ2 marksNeeds review
Mechanical stress is applied on a polymer. Identify the correct match(es) between the statements (1, 2, 3, 4, 5) that describe the deformations and the regimes (P, Q, R).
P: Rubbery regime
Q: Region around glass transition temperature (T_g)
R: Sample under deformed state
Stress-relaxation takes place and the excess free energy is dissipated
The motions of the molecules are long-range
Segmental motion of the molecules is important
The maximum relaxation time is strongly dependent on the molecular weight
The deformations are independent of the molecular weight and primarily depend on the local structure
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