Answer :

Solution :

Rough cutting of brass, silicon carbide should be used as abrasive, therefore options with Al2O3 as abrasive are eliminated.

Also, brass is a soft material so, the hard wheel is required for its grinding ‘J’ lies in (A-H) range i.e. for the soft wheel so, it can’t be used whereas Q represents hard wheel.

So, we will go for grinding wheel with specification C30Q12V