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ISRO ME Quiz 9 : Vibrations
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Question 1
Which one of the following causes whirling of shafts?
Question 2
A rolling disc of radius ‘r’ and mass ‘m’ is connected to one end of a linear spring of stiffness ‘k’, as shown in the figure below. The natural frequency of oscillation is given by which one of the following?
Question 3
The static deflection of a shaft under a flywheel is 4 mm. Taking g=10 m/s2, What is the critical speed in rad/s?
Question 4
In case of free vibration with viscous damping, the damping force is proportional to
Question 5
In a vibrating system the spring has stiffness 32 N/m and the mass 2 kg. The system is having a damper whose coefficient of viscous damping is 8 N-s/m. The system is :
Question 6
The equation of free vibration of a system is 
. Its natural frequency would be
. Its natural frequency would be Question 7
As compared to the time period of a simple pendulum on the earth, its time period on the moon will be
Question 8
The speed rating for turbine rotors is invariably more than 
times its natural frequency to
times its natural frequency to Question 9
A mass M vibration on a frictionless platform between two sets of springs having individual spring constant as shown in the figure below. What is the combined spring constant of the system?
Question 10
Critical speed is expressed as
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