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| Q. |
Surface roughness depends on current density, which is affected by which of the following? |
| A. | tool feed rate |
| B. | gap voltage |
| C. | work piece material |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: roughness depend on current density, which is affected by tool feed rate, gap voltage, work material, ph number, temperature, conductivity and pressure. | |
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