Q. Which of the following statements is/are true?
✅ Correct Answer: (A)
Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction
Dynamics of Machinery MCQs | Page - 2
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Q. In the diagram shown below, if rotor X and rotor Z rotate in same direction and rotor Y rotates in opposite direction, then specify the type of node vibration.
✅ Correct Answer: (B)
Two node vibration
Q. What is the total number of nodes formed in a three rotor system if the rotors at one of the ends and the one in the middle rotate in the
✅ Correct Answer: (B)
1
Q. In a multi-rotor system of torsional vibration maximum number of nodes that can occur is:
✅ Correct Answer: (D)
Equal to the number of rotors minus one
Q. During torsional vibration of a shaft, the node is characterized by
✅ Correct Answer: (D)
Zero angular displacement
Q. The mass moment of inertia of the two motors in a two rotor system are 100 kgm2 and 10 kgm2 the length of the shaft of uniform
✅ Correct Answer: (C)
100 cm
Q. What is the number of nodes in a shaft carrying three rotors?
✅ Correct Answer: (B)
2
Q. Consider the following statements: Two rotors mounted on a single shaft can be considered to be equivalent to a geared-shaft system having two rotors provided 1. The kinetic energy of the equivalent system is equal to that of the original system. 2. The strain energy of the equivalent system is equal to that of the original system. 3. The shaft diameters of the two systems are equal. Which of these statements are correct?
✅ Correct Answer: (A)
1, 2 and 3
Q. Two rotors A and B are connected to the two ends of a shaft of uniform diameter. The mass moment of inertia of rotor A about the
✅ Correct Answer: (A)
1/5 m
Q. Which one of the following is correct for a shaft carrying two rotors at its ends?
✅ Correct Answer: (B)
It has one node
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