Production and Industrial Engineering
GATE PI topic:polymers-composites PYQs
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How to practice topic:polymers-composites
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 11. Imported answers require independent review unless marked reviewed.
Question 36
Open questionPIMCQ2 marksNeeds review
In a polymer extrusion process, some cross-sectional shapes of the extruded polymers are shown. Cross-sections of available dies are also shown.
Which ONE of the following CORRECTLY matches the extruded cross section with the die opening that most likely generated it?
Note: The cross-sections are in a plane orthogonal to the extrusion direction. Figures are not to scale.
Cross-section of extruded polymer: (P) circle; (Q) square.
Cross-section of die opening: (1) circular opening; (2) square opening; (3) oval opening; (4) concave, waisted opening.
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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 65
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In the composite filament winding process as shown in the figure, the mandrel diameter is 70 mm and is rotating at a speed,
rev/min.If a 45° helical wind angle is needed, the axial velocity,
, of the slider should be _____ m/s (rounded off to two decimal places).Assume
. Ignore the thickness of the composite layers already wound on the mandrel.
Note: Figure is not to scale.
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Which one of the following statements is FALSE with respect to the injection molding of polymer composite?
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For polymers, match each process with the most suitable application listed.
Process: P — Extrusion; Q — Injection molding; R — Blow molding; S — Compression molding.
Application: 1 — Producing complex parts with close tolerance; 2 — Producing thermosetting plastic components; 3 — Producing long uniform sections; 4 — Producing hollow shapes.
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The most appropriate process for manufacturing of plastic chair is
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In injection blow molding of plastic beverage bottles, the blowing is accomplished by
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Match the component with the corresponding manufacturing process in the table below.
Component | Manufacturing process |
|---|---|
P: Aluminum alloy piston for IC engine | 1: Blow molding |
Q: Low carbon steel oil pan | 2: Powder metallurgy |
R: Tungsten carbide cutting tool insert | 3: Sand casting |
S: Plastic bottle | 4: Deep drawing |
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The process used for producing long bars of fiber reinforced plastics (FRP) with uniform cross-section is
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The process used for producing continuous insulation coating on an electrical wire is
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The process in which molten thermoplastic is forced between rolls to produce thin sheets is called
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