Engineering Sciences
GATE XE kind:question PYQs
Build your understanding with focused practice from past exam papers.
Questions 1011–1020 of 1772. Imported answers require independent review unless marked reviewed.
Question 5
Open questionXE-FMCQ1 markNeeds review
Which one of the following is an example of a biodegradable polymer?
Your answerChoose one option.
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Polymer crystals show a range of melting points in contrast to single melting point of crystals of small molecules, because ________.
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When the rate of cooling is increased during the solidification process, the glass transition temperature of a polymer ________.
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Open questionXE-FMCQ1 markNeeds review
Equal and opposite forces of a constant magnitude
are applied at the two ends of a thin elastomeric rod, which is held at a temperature
(
), where
and
are the glass transition temperature and melting temperature respectively. If the temperature is increased to
(
and
), the rod will ____________.Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
The size of a coiled polymer chain in a dilute solution is
in a good solvent,
in an ideal solvent and
in a poor solvent. Select the correct ordering of sizes.Your answerChoose one option.
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Open questionXE-FMCQ2 marksNeeds review
Match the Additive to its Function.
Additive | Function |
|---|---|
P. Triotyl phosphate | 1. Couping Agent |
Q. Triethoxy vinyl silane | 2. Antioxidant |
R. Azoisobutyronitrile | 3. Plasticizer |
S. 4-Methyl-2,6-di-t-butyl phenol | 4. Blowing Agent |
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Open questionXE-FMCQ2 marksNeeds review
Match the polymer processing operation with respect to its typical range of shear rate.
Processing Operation | Shear rate (s⁻¹) |
|---|---|
P. Compression Moulding | 1. 1000 - 10000 |
Q. Extrusion | 2. 100 - 1000 |
R. Calendering | 3. 1 - 10 |
S. Injection Moulding | 4. 10 - 100 |
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Open questionXE-FMCQ2 marksNeeds review
Shear stress (
) and shear viscosity (
) are plotted as functions of the shear rate,
, for idealized “solid-like with yielding (1)” and “liquid-like (2)” materials.
Associate the shear stress and viscosity plots with the appropriate material responses.
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Open questionXE-FNAT2 marksNeeds review
The plateau modulus of polystyrene has a value of 0.2 × 10⁶ Pa at 150 °C. Given, the density of polystyrene is 1.05 g/cm³, the universal gas constant,
= 8.3 J K⁻¹ mol⁻¹, and the monomer molecular weight is 104 g/mol. The molecular weight between entanglements (rounded off to the nearest integer) of polystyrene chains is ______ g/mol.Log in to check the answer
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Open questionXE-FNAT2 marksNeeds review
A unidirectional composite of epoxy and carbon fiber of 50% by volume is made. The elastic modulus of epoxy and carbon fiber are 3.5 GPa and 350 GPa, respectively. The ratio (rounded off to one decimal place) of the modulus of the composite to the matrix modulus is ______.
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