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| Q. |
Which of the following statements is/are true? |
| A. | Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction |
| B. | Shaft vibrates with maximum frequency when rotors rotate in same direction |
| C. | Zero node behavior is observed in rotors rotating in opposite direction |
| D. | All of the above |
| Answer» A. Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction | |
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