Answer is:
Y
Explanation:
The hardness of a grinding wheel is specified by a letter of alphabet. The alphabets A to H are soft grades, I to P are medium grades and Q to Z are hard grades.
Answer is:
30 metres/min.
Answer is:
All of the above
Explanation:
Natural abrasives are
* Corrundum
* Diamond
* Emery
Answer is:
Aluminium oxide
Explanation:
A grinding wheel consists of the abrasive that does the cutting, and the bond that holds the abrasive particles together.
There are two types of abrasives.
1. Natural abrasive The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
2. Artificial abrasive Artificial abrasives are silicon carbide and aluminium oxide.