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| Q. |
The secondary critical speed of a shaft occurs at |
| A. | Twice the primary critical speed |
| B. | Occurs only when there are more than 2 rotors on a shaft |
| C. | Four times the primary critical speed |
| D. | If the externam exciting system has a frequency other than the primary critical speed |
| E. | Half the primary critical speed |
| Answer» A. Twice the primary critical speed | |
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