Theory of Machine
The danger of breakage and vibration is maximum

Near the critical speed
Above the critical speed
Below the critical speed
None of these

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

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