Types of vibration node

Q.  In the diagram shown below, if rotor X and rotor Z rotate in same direction and rotor Y rotates in opposite direction, then specify the type of node vibration.
- Published on 10 Sep 15
Three-rotor-system.png


a. Three node vibration
b. Two node vibration
c. Single node vibration
d. None of the above

ANSWER: Two node vibration

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