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| Q. |
In case of spur gears the profile is |
| A. | Radius that connects the root circle to the profile of the tooth |
| B. | The curve forming face and flank |
| C. | The part of the tooth surface lying below the pitch surface |
| D. | The surface of the top of tooth |
| E. | The width of the gear tooth measured axially along the pitch surface |
| Answer» B. The curve forming face and flank | |
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