Dynamics of Machinary MCQs with answers Page - 9

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Q. D-Alembert’s principle is used for which of the following?

  • (A) Change static problem into a dynamic problem
  • (B) Change dynamic problem to static problem
  • (C) To calculate moment of inertia of rigid bodies
  • (D) To calculate angular momentum of a system of masses

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Q. Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles.

  • (A) 0.223
  • (B) 0.8958
  • (C) 0.389
  • (D) None of the above

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Q. Calculate logarithmic decrement if damping factor is 0.33.

  • (A) 1.36
  • (B) 3.23
  • (C) 5.16
  • (D) 2.19

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Q. In damped free vibrations, which parameters indicate vibrations?

  • (A) Natural frequency
  • (B) Rate of decay of amplitude
  • (C) Both a. and b.
  • (D) None of the above

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Q. What is meant by critical damping coefficient?

  • (A) Frequency of damped free vibrations is less than zero
  • (B) The motion is aperiodic in nature
  • (C) Both a. and b.
  • (D) None of the above

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Q. Which of the following relations is true for viscous damping?

  • (A) Force α relative displacement
  • (B) Force α relative velocity
  • (C) Force α (1 / relative velocity)
  • (D) None of the above

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Q. Which among the following is the value of static deflection (δ) for a fixed beam with central point load?

  • (A) (Wl3) /(192 EI)
  • (B) (Wl2) /(192 EI)
  • (C) (Wl3) /(384 EI)
  • (D) None of the above

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Q. Fluid resistance causes damping which is known as ______

  • (A) Resistance damping
  • (B) Fluid damping
  • (C) Viscous damping
  • (D) Liquid damping

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Q. In which direction does the accelerating force acts?

  • (A) Opposite to the motion
  • (B) Along the motion
  • (C) Perpendicular to motion
  • (D) Variable

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Q. The time interval after which the motion is repeated itself is known as ___________ .

  • (A) Time period
  • (B) Cycle
  • (C) Frequency
  • (D) Isolation

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