GATE 2023 PI – Question 22

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

A copper rod 200 mm in diameter and 400 mm long is extruded to diameter 100 mm. Find the extrusion ratio.

Show answer and explanation

Correct answer: (C) 4

Explanation

Extrusion ratio is initial/final cross-sectional area: $R=A_0/A_f=(200/100)^2=\mathbf4$. **C**. Initial rod length does not enter this area ratio.

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