Theory of Machine
A reed type tachometer use the principle of

Torsional vibration
Damped free vibration
Transverse vibration
Longitudinal vibration

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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 centre of the disc has zero acceleration
All points of the disc have the same velocity
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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