Engine: Expired / General Subjects

1. A The critical speed of a shaft is the speed at which it will shear due to excessive torque placed upon it by the prime mover in driving the load.
2. B The critical speed of a shaft is the speed of rotation that is out of harmonic synchronism with the shaft's natural vibration frequency which produces excessive vibration.
3. C The critical speed of a shaft is the speed of rotation that is in harmonic synchronism with the shaft's natural vibration frequency which produces excessive vibration.
4. D The critical speed of a shaft is the speed at which it will fly apart due to excessive centrifugal forces associated with excessive speed.

Tip: press A-D to answer