MCQOPTIONS
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| 1. |
Cutting tool is much harder than the work piece. Yet the tool wears out during the tool-work interaction, because |
| A. | extra hardness is imparted to the work piece due to coolant used |
| B. | oxide layers on the work piece surface impart extra hardness to it |
| C. | extra hardness is imparted to the work piece due to severe rate of strain |
| D. | vibration of induced in the machine tool |
| Answer» D. vibration of induced in the machine tool | |