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| Q. |
In Electro discharge machining, materials with low melting point have which type of surface roughness? |
| A. | rough |
| B. | smooth |
| C. | fine |
| D. | all of the mentioned |
| Answer» A. rough | |
| Explanation: in electro discharge machining, materials having low melting point have high rougher surfaces and vice-versa. | |
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