Characteristics of torsional vibrations

Q.  Which of the following statements is/are true?
- Published on 10 Sep 15

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: Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction

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