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

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Theory of Machine
Power of a governor is the

Mean force exerted at the sleeve for a given percentage change of speed
Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for maximum equilibrium speed
None of these

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