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GATE 2020 ME (ME1) – Question 22

Machining and Machine Tool Operations · Abrasive and non-traditional machining processes · 1 mark · Multiple choice

The base of a brass bracket needs rough grinding. Which grinding-wheel specification is most suitable?

  1. C30Q12V
  2. A50G8V
  3. C90J4B
  4. A30D12V

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Correct answer: (A) C30Q12V

Explanation

Brass is a soft nonferrous material, for which silicon carbide (C) is appropriate. Rough grinding needs coarse grit (30) and an open structure (12) to reduce loading; a harder grade Q helps retain the grains. This combination is **C30Q12V, A**.