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
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Open belt drive is recommended
Both open belt drive and crossed belt drive is recommended

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