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| Q. |
Efficiency of a screw jack in maximum when its 31 helix angle, ? is |
| A. | 45 + ?/2 |
| B. | 107 dynes |
| C. | ? |
| D. | 45 - ?/2 |
| E. | 45? |
| Answer» D. 45 - ?/2 | |
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