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Q. |
It is desired to punch a hole of 20 mm diameter in a plate 20 mm think. If the shear stress of mild steel is 30 kg/mm2, the force necessary for punching would be approximately in the range |
A. | 20 - 25 tonnes |
B. | 15 - 20 tonnes |
C. | 10 - 15 tonnes |
D. | 35 - 40 tonnes |
E. | 25 - 35 tonnes |
Answer» D. 35 - 40 tonnes |
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