Theory of Machine
A reed type tachometer use the principle of

Damped free vibration
Longitudinal vibration
Transverse vibration
Torsional 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 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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