Topic: Mechanical Vibrations
In a multi-rotor system of torsional vibrations, maximum number of nodes that can occur is
- A. Two
- B. Equal to number of rotors plus one
- C. Equal to number of rotors
- D. Equal to number of rotors minus one
Answer: D. Equal to number of rotors minus one
Explanation: In a torsional vibration system with $n$ rotors mounted on a shaft, the maximum number of natural frequencies is $n-1$. Each natural frequency corresponds to a mode shape, and the highest mode shape will have a maximum of $n-1$ nodes.