McqMate

Q. |
## The frequency of the free torsional vibration depends on….... |

A. | number of rotors |

B. | the number of nodes |

C. | Both a and b |

D. | Only b |

Answer» C. Both a and b |

696

0

Do you find this helpful?

3

View all MCQs in

Dynamics of MachineryNo comments yet

- A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a single node system in Hz if the mass moment of inertia of rotors in Kg-m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
- A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a two node system in Hz if the mass moment of inertia of rotors in Kg-m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
- For occurrence of free torsional vibration which of the condition is necessary?
- For occurrence of free torsional vibration in a three rotor system which of the condition is necessary?
- Increasing which of the following factor would result in increase of free torsional vibration?
- In a multi-rotor system of torsional vibration maximum number of nodes that can occur is:
- During torsional vibration of a shaft, the node is characterized by
- In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.
- In a gearing system, pump speed is one third of the motor. Shaft from motor is 6 cm in diameter and 30cm long, the impellar shaft is 10cm diameter and 60cm long. Mass moment of inertia is 1500 Kgm2, C = 80Gn/m2. Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.
- At a nodal point in the shaft, the frequency of vibration is _________