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| Q. |
What must be the working voltage in Electrochemical machining? |
| A. | 10 v |
| B. | 20 v |
| C. | 30 v |
| D. | 40 v |
| Answer» B. 20 v | |
| Explanation: the electrolytes in ecm employ a working voltage up to 20 v. | |
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