Question

The base of a brass bracket needs rough grinding. For this purpose, the most suitable grinding wheel grade specification is

• A. A50G8V
• B. C30Q12V
• C. A30D12V
• D. C90J4B

Answer 1

The correct option is B C30Q12V

For brass 'Silicon carbide' is the abrasive. As brass is soft material, we need hard wheel,
Therefore 'Q' is the best choice.
$\underset{soft}{A}\to \underset{hard}{Z}$
So, 'J' is in the softer side.
So best option is (b).