Dynamics of Machinary MCQs with answers Page - 2

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A

Admin • 802.91K Points
Coach

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

A

Admin • 802.91K Points
Coach

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.

  • (A) Three node vibration
  • (B) Two node vibration
  • (C) Single node vibration
  • (D) None of the above

A

Admin • 802.91K Points
Coach

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

  • (A) 0
  • (B) 1
  • (C) 2
  • (D) 3

A

Admin • 802.91K Points
Coach

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

A

Admin • 802.91K Points
Coach

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

A

Admin • 802.91K Points
Coach

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

  • (A) 80 cm
  • (B) 90 cm
  • (C) 100 cm
  • (D) 110 cm

A

Admin • 802.91K Points
Coach

Q. What is the number of nodes in a shaft carrying three rotors?

  • (A) zero
  • (B) 2
  • (C) 3
  • (D) 4

A

Admin • 802.91K Points
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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?

  • (A) 1, 2 and 3
  • (B) 1 and 2
  • (C) 2 and 3
  • (D) 1 and 3

A

Admin • 802.91K Points
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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

  • (A) 1/5 m
  • (B) 4/5 m
  • (C) 1/25 m
  • (D) 16/25 m

A

Admin • 802.91K Points
Coach

Q. Which one of the following is correct for a shaft carrying two rotors at its ends?

  • (A) It has no node
  • (B) It has one node
  • (C) It has two nodes
  • (D) It has three nodes

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