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ISRO 2018 Theory of Machines & Vibration Booster Quiz 2
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Question 1
Whirling speed of a shaft coincides with the natural frequency of its
Question 2
Logarithmic decrement of a damped single degree of freedom system is ξ. If stiffness of spring is doubled and mass is made half, then logarithmic decrement of the new system will be equal to
Question 3
A rigid body is rotating with constant angular velocity 
about fixed axis, if 
velocity of a point of the body, then curl 
=
about fixed axis, if velocity of a point of the body, then curl = Question 4
The equation of motion for a damped vibration is given by 
. The damping factor will be
. The damping factor will be Question 5
Four linear elastic springs are connected to mass ‘M’ as shown in figure. The natural frequency of the system is
Question 6
Two springs of equal length but having stiffness of 10N/mm and 15N/mm support a mass of 2 tonnes in series. Find the frequency of vibration
Question 7
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the center of the bigger gear is
Question 8
As shown in the figure a mass of 100kg is held between two springs. The natural frequency of vibration of the system in cycle/s is
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