Theory of Machine
Which of the following governor is used to drive a gramophone?

Hartnell governor
Pickering governor
Watt governor
Porter governor

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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?

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

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