Top 150+ Solved Dynamics of Machinery MCQ Questions Answer
Q. Which type of vibrations are also known as transient vibrations?
a. Undamped vibrations
b. Damped vibrations
c. Torsional vibrations
d. Transverse vibrations
Q. During transverse vibrations, shaft is subjected to which type of stresses?
a. Tensile stresses
b. Torsional shear stress
c. Bending stresses
d. All of the above
Q. What are deterministic vibrations?
a. Vibrations caused due to known exciting force
b. Vibrations caused due to unknown exciting force
c. Vibrations which are aperiodic in nature
d. None of the above
Q. Which of the following vibrations are classified according to magnitude ofactuating force?
a. Torsional vibrations
b. Deterministic vibrations
c. Transverse vibrations
d. All of the above
Q. In which type of vibrations, amplitude of vibration goes on decreasing everycycle?
a. Damped vibrations
b. Undamped vibrations
c. Both a. and b.
d. None of the above
Q. The resonant frequency of a mass-spring system depends upon ________
a. stiffness
b. surface density
c. depth of air space
d. all of the above
Q. Calculate equivalent stiffness of the spring for the system shown below,which has spring stiffness of 3000 N/m
a. 1000 N/m
b. 2250 N/m
c. 2000 N/m
d. None of the above
Q. Which of the following is incorrect regarding inertia force?
a. Imaginary force
b. Acts upon a rigid body
c. Brings the body to equilibrium
d. Same direction as of accelerating force
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
Q. Determine logarithmic decrement, if the amplitude of a vibrating bodyreduces to 1/6th in two cycles.
a. 0.223
b. 0.8958
c. 0.389
d. None of the above
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
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
Q. According to which method, maximum kinetic energy at mean position isequal to maximum potential energy at extreme position?
a. Energy method
b. Rayleigh's method
c. Equilibrium method
d. All of the above
Q. The motion of a system executing harmonic motion with one naturalfrequency is known as _______
a. principal mode of vibration
b. natural mode of vibration
c. both a. and b.
d. none of the above