Dynamics of Machinary MCQs with answers Page - 10

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Q. Frequency of vibrations is usually expressed in

  • (A) Number of cycles per hour
  • (B) Number of cycles per minute
  • (C) Number of cycles per second
  • (D) None of these

A

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Q. The motion completed during one time period is known as _______.

  • (A) Period of vibration
  • (B) Cycle
  • (C) Frequency
  • (D) All of the above

A

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Q. Which of the following is a type of free vibration?

  • (A) Longitudinal vibrations
  • (B) Transverse vibrations
  • (C) Torsional vibrations
  • (D) A, B and C

A

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Q. In a spring-mass system, which of the following force is not considered?

  • (A) Spring force
  • (B) Damping force
  • (C) Accelerating force
  • (D) A and B

A

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Q. The periodic time is given by _______.

  • (A) ω / 2 π
  • (B) 2 π / ω
  • (C) 2 π × ω
  • (D) π/ω

A

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Q. For a vibration system having different shaft parameters, calculate which of the following cannot be the diameter of the equivalent shaft if the diameters of shafts in m are: 0.05, 0.06, 0.07.

  • (A) 0.05
  • (B) 0.06
  • (C) 0.07
  • (D) 0.08

A

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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 single 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) 171
  • (B) 181
  • (C) 191
  • (D) 201

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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

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Q. For a gearing system, the equivalent system is made consisting of two rotors. How many nodes will this new equivalent system will have?

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

A

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Q. In a gearing system, pump speed is one third of the motor. Shaft from motor is 6 cm in diameter and 30cm long, the impellar shaft is 10cm diameter and 60cm long. Mass moment of inertia is 1500 Kgm2, C = 80Gn/m2. Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.

  • (A) 4.7
  • (B) 5.7
  • (C) 4.5
  • (D) 5.5

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