Question

a grinding wheel should be replaced when worn to ____ of its original diameter.
a. 1/2
b. 1/4
c. 3/8
d. 1/8

Explanation:

This is a knowledge - based question about the replacement criteria of a grinding wheel. In industrial or mechanical work, it is a standard practice to replace a grinding wheel when it is worn to a certain fraction of its original diameter. The correct fraction is 3/8.

Answer:

C. 3/8