GATE 2023 PI – Question 16

Manufacturing Processes II · Machining · 1 mark · Multiple choice

An alumina grinding wheel has ANSI designation 51 A 36 K 5 V 23. What does K indicate?

The abrasive is aluminium oxide.
The wheel hardness is medium.
The bonding material is shellac.
The wheel structure is dense.

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Show answer and explanation

Correct answer: (B) The wheel hardness is medium.

Explanation

The designation separates abrasive A, grain size 36, grade K, structure 5 and vitrified bond V. K is the wheel grade, expressing bond holding strength or wheel hardness, in the medium range. **B**.

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