Engineering Sciences
GATE XE topic:applied-science PYQs
Build your understanding with focused practice from past exam papers.
Questions 311–320 of 1772. Imported answers require independent review unless marked reviewed.
Question 114
Open questionXE-FMCQ1 markNeeds review
Polymer “Z” has a high melting point and it decomposes even before it melts. Hence, it is usually dissolved and subsequently regenerated. Rayon is one such regenerated form. Identify the polymer “Z” from the following options.
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
Match the Product with the most appropriate Processing Technique employed.
Product | Processing Technique |
|---|---|
P: Rainbows | 1: Blow molding |
Q: Disposable plastic cups | 2: Calendering |
R: Soft drink bottles | 3: Rotational molding |
S: Flexible films | 4: Thermoforming |
Choose the correct matching from the following options.
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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
Crystallization is favored in polymer melts when the chain entanglement is ________________ and only polymers with ________________ molecular arrangement can crystallize.
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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
Match the Polymer with the most suitable Monomer combinations from which it is synthesized.
Polymer | Monomer combinations |
|---|---|
P: Polyurethane | 1: Maleic acid and propylene glycol |
Q: Epoxy | 2: Pyromellitic anhydride and p,p′-diaminodiphenyl ether |
R: Polyimide | 3: Epichlorohydrin and bisphenol A |
S: Polyester | 4: Hexamethylene diisocyanate and tetramethylene glycol |
Choose the correct matching from the following options.
Your answerChoose one option.
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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
Open questionXE-FMCQ1 markNeeds review
Thermoplastic Polyurethane and Polyamide 6 both contain amide linkages, but when compared to Polyurethane, Polyamide 6 shows higher melting point due to ________________.
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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-FMCQ2 marksNeeds review
Injection molding is typically used to make plastic parts. If the pressure at the gate is monitored as a function of time during the injection of a thermoplastic polymer, identify the profile that best describes this event.
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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
The ‘unperturbed dimension’ of the polymer chain is represented as,
where,
= root-mean square end-to-end distance
= average length of a segment
= number of segments in the chain Using the above information, root-mean square end-to-end distance of a branched polyethene would be ________________ when compared with that of the linear polyethene of the same molecular weight and the same number of segments.Your answerSelect all correct options. You can choose more than one.
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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 121
Open questionXE-FMSQ2 marksNeeds review
Choose the option(s) that correct match(es) the Zones with their typical Functions in an industrial extruder.
Zones: P — Feed zone; Q — Compression zone; R — Metering zone.
Functions: 1 — The melt acquires a constant flow rate; 2 — No heating takes place; 3 — Polymer melts due to heat transferred from the heating element; 4 — The helical flight of the screw imparts constant flow of the melt; 5 — Polymer melts due to shear forces imparted by 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 122
Open questionXE-FMSQ2 marksNeeds review
During material testing, stress is applied from time
to
as shown below:
The corresponding strain responses for three different materials are shown in plots P, Q and R.
Choose the option(s) where the strain response is correctly mapped to its material class.
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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
Which option(s) correctly match(es) the Polymer property with its appropriate Units?
Polymer property: P — Hildebrand solubility parameter; Q — Loss modulus; R — Toughness; S — Flexural strength.
Units: 1 — Pa; 2 — J m
; 3 — (MPa)
; 4 — Kg m
s
.Your answerSelect all correct options. You can choose more than one.
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