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GATE 2020 MT – Question 26

Mechanical Behaviour of Materials · Plasticity and yield criteria · 1 mark · Multiple choice

The indenter used for Rockwell C hardness is a

  1. Diamond cone
  2. 10 mm steel ball
  3. Diamond pyramid
  4. 1/16-inch steel ball

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Show answer and explanation

Correct answer: (A) Diamond cone

Explanation

Rockwell C uses a conical diamond indenter, often called a Brale indenter. The ball alternatives belong to other hardness arrangements, and a diamond pyramid is characteristic of Vickers testing. Thus A. The scale letter identifies the indenter/load combination, not merely the general idea of indentation hardness.

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