Top 150+ Solved Dynamics of Machinery MCQ Questions Answer
Q. Which of the following statements is/are true?
a. Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction
b. Shaft vibrates with maximum frequency when rotors rotate in same direction
c. Zero node behavior is observed in rotors rotating in opposite direction
d. All of the above
Q. In the diagram shown below, if rotor X and rotor Z rotate insame direction and rotor Y rotates in opposite direction, then specify the type of node vibration.
a. Three node vibration
b. Two node vibration
c. Single node vibration
d. None of the above
Q. In a multi-rotor system of torsional vibration maximum number of nodes that can occur is:
a. Two
b. Equal to the number of rotor plus one
c. Equal to the number of rotors
d. Equal to the number of rotors minus one
Q. During torsional vibration of a shaft, the node is characterized by
a. Maximum angular velocity
b. Maximum angular displacement
c. Maximum angular acceleration
d. Zero angular displacement
Q. The mass moment of inertia of the two motors in a two rotor systemare 100 kgm2 and 10 kgm2 the length of the shaft of uniform
a. 80 cm
b. 90 cm
c. 100 cm
d. 110 cm
Q. Two rotors A and B are connected to the two ends of a shaft ofuniform diameter. The mass moment of inertia of rotor A about the
a. 1/5 m
b. 4/5 m
c. 1/25 m
d. 16/25 m
Q. Which one of the following is correct for a shaft carrying two rotorsat its ends?
a. It has no node
b. It has one node
c. It has two nodes
d. It has three nodes
Q. A system, which is free from both the ends
a. Definite system
b. Semidefinite system
c. Both a and b
d. None of the above
Q. A system, which is fixed from one end or both the ends is referredas
a. Definite system
b. Semidefinite system
c. Both a and b
d. None of the above
Q. At a nodal point in the shaft, the frequency of vibration is_________
a. Zero
b. Double than at the ends
c. Minimum
d. Maximum