Dynamics of Machinary MCQs with answers Page - 12

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Q. 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

  • (A) 257
  • (B) 281
  • (C) 197
  • (D) 277

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Q. Increasing which of the following factor would result in increase of free torsional vibration?

  • (A) Radius of gyration
  • (B) Mass moment of inertia
  • (C) Polar moment of inertia
  • (D) Length

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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

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Q. For a two rotor system, the mass moment of inertia of one shaft(A) is twice the other(B), then what is the relation between the length of the shafts.

  • (A) 2L(A) = L(B)
  • (B) L(A) = 2L(B)
  • (C) L(A) = L(B)
  • (D) 2L(A) = 3L(B)

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Q. Which of the following is true for centrifugal force causing unbalance?

  • (A) Direction changes with rotation
  • (B) Magnitude changes with rotation
  • (C) Direction and magnitude both change with rotation
  • (D) Direction and magnitude both remain unchanged with rotation

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Q. If the unbalanced system is not set right then.

  • (A) Static forces develop
  • (B) Dynamic forces develop
  • (C) Tangential forces develop
  • (D) Radial forces develop

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Q. What is the effect of a rotating mass of a shaft on a system?

  • (A) Bend the shaft
  • (B) Twist the shaft
  • (C) Extend the shaft
  • (D) Compress the shaft

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Q. In a revolving rotor, the centrifugal force remains balanced as long as the centre of the mass of the rotor lies ___________

  • (A) Below the axis of shaft
  • (B) On the axis of the shaft
  • (C) Above the axis of shaft
  • (D) Away from the axis of shaft

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Q. Often an unbalance of forces is produced in rotary or reciprocating machinery due to the ______

  • (A) Centripetal forces
  • (B) Centrifugal forces
  • (C) Friction forces
  • (D) Inertia forces

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Q. The mass used to balance the mass defect is known as ______

  • (A) Balancing mass
  • (B) Defect mass
  • (C) Replacement mass
  • (D) Fixing mass

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