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?

The centre of the disc has zero acceleration
All points of the disc have the same velocity
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 inversion of a mechanism is

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

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