The GATE Grind

GATE 2026 PI – Question 26

Manufacturing Processes I · Metal Forming · 1 mark · Multiple select

Match defects P: centerburst; Q: earing; R: zipper cracks; S: cold shut, with processes 1: deep drawing; 2: rolling; 3: extrusion; 4: closed-die forging; 5: casting. Select ONE OR MORE correct mappings.

  1. P–3; Q–1; R–2; S–4
  2. P–5; Q–2; R–3; S–4
  3. P–1; Q–2; R–4; S–5
  4. P–3; Q–1; R–2; S–5

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Correct answer: (A) P–3; Q–1; R–2; S–4; (D) P–3; Q–1; R–2; S–5

Explanation

Centerburst is an internal extrusion defect. Earing arises from sheet anisotropy in deep drawing; zipper cracks occur along the strip center in rolling. Cold shuts can occur where metal streams fail to fuse in casting, and where folded surfaces fail to bond in forging. Therefore both **A,D** are correct.

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