Topic: Theory of Machines / Vibrations
Whirling speed of a shaft coincides with the natural frequency of its-
- A. Longitudinal vibration
- B. Transverse vibration
- C. Torsional vibration
- D. Coupled bending torsional vibration
Answer: B. Transverse vibration
Explanation: The whirling speed or critical speed of a shaft is the rotational speed at which a spinning shaft will tend to vibrate violently in the transverse direction. This resonance occurs when the speed coincides with the natural frequency of its transverse vibration.