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GATE 2025 PI – Question 21

Manufacturing Processes I · Polymers and Composites · 1 mark · Multiple choice

Which statement about injection molding a polymer composite is FALSE?

  1. Molten polymer and reinforcement are injected into a closed mold.
  2. Material deforms plastically to adopt the mold-cavity shape.
  3. Melt temperature, injection speed and screw speed are important parameters.
  4. Common reinforcements include particles, whiskers and short fibers.

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Show answer and explanation

Correct answer: (B) Material deforms plastically to adopt the mold-cavity shape.

Explanation

Injection molding shapes a flowing polymer melt in a cavity and then solidifies it; it is not the solid-state plastic deformation mechanism asserted in B. The other statements describe common feedstocks and controls. Therefore **B**.

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