Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

All points of the disc have the same velocity
The centre of the disc has zero acceleration
The centre of the disc has centrifugal acceleration
The point on the disc making contact with the plane surface has zero acceleration

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Theory of Machine
The maximum fluctuation of energy is the

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

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Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Obtained by reversing the input and output motion
Changing of a higher pair to a lower pair
Turning its upside down

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