Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

All of these
Longitudinal vibrations
Transverse vibrations
Torsional vibrations

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Theory of Machine
The maximum fluctuation of energy is the

Variations of energy above and below the mean resisting torque line
Ratio of the mean resisting torque to the work-done per cycle
Sum of the maximum and minimum energies
Difference between the maximum and minimum energies

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Theory of Machine
Which is the false statement about the properties of instantaneous center?

The double center can be denoted either by O2 or O12, but proper selection should be made
The two rigid links have no linear velocities relative to each other at the instantaneous center
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

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