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1. |
A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is |
A. | .2 mm |
B. | 0 mm |
C. | 0 mm |
D. | 00 mm |
Answer» D. 00 mm | |