Correct option is B
The G-ratio in grinding is the ratio of the volume of material removed to the volume of wheel wear. It is an important parameter in determining the efficiency of a grinding process. In very rough grinding, where the focus is on rapid material removal rather than precision or surface finish, the G-ratio tends to be low. This is because the grinding wheel experiences more wear due to the aggressive nature of the process.
For very rough grinding, the G-ratio typically ranges from 1.0 to 5.0, as indicated in option b.
Thus, the correct answer is 1.0 to 5.0.
