Dynamics of Machinary MCQs with answers Page - 11

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Q. When inertia of gearing is taken into consideration, then which of the following should be taken into account.

  • (A) Addition of rotor
  • (B) Addition of gear
  • (C) Addition of shaft
  • (D) Addition of pump

A

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Q. Consider P and Q as the shaft having two rotors at the end of it, what is the point N known as in the given figure?

  • (A) Node
  • (B) Elastic point
  • (C) Inelastic point
  • (D) Breaking point

A

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Q. For occurrence of free torsional vibration which of the condition is necessary?

  • (A) Rotors moving in same direction
  • (B) Rotors having same frequency
  • (C) Rotors having different frequency
  • (D) Rotors rotate in the same sense

A

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Q. n the given figure if N is the node then NQ acts as which of the following system?

  • (A) Single rotor system
  • (B) Two rotor system
  • (C) Three rotor system
  • (D) Four rotor system

A

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Q. Keeping the mass moment of inertia of both the shafts in a two rotor system same, if the length of one shaft is doubled what should be the effect on the length of other shaft?

  • (A) Doubled
  • (B) Halved
  • (C) Constant
  • (D) increased to 4 times

A

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Q. In the figure given below, the points N1 and N2 are known as_______

  • (A) Nodes
  • (B) Elastic points
  • (C) Inelastic points
  • (D) Breaking points

A

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Q. 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.

  • (A) B in clockwise C in anticlockwise
  • (B) C in clockwise B in anticlockwise
  • (C) B and C in clockwise
  • (D) B and C in anticlockwise

A

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Q. For occurrence of free torsional vibration in a three rotor system which of the condition is necessary?

  • (A) Rotors moving in same direction
  • (B) Rotors having same frequency
  • (C) Rotors having different frequency
  • (D) Rotors rotate in the same sense

A

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Q. A vertical circular disc is supported by a horizontal stepped shaft as shown below. Determine equivalent length of shaft when equivalent diameter is 20 mm.

  • (A) 1.559 m
  • (B) 0.559 m
  • (C) 0.633 m
  • (D) None of the above

A

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Q. In a three rotor system, for the middle rotor, if the stiffness of both the length either side of the rotor is increased to two times what will

  • (A) Remains constant
  • (B) Decreases by two times
  • (C) Increases by two times
  • (D) Increases by 4 times

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