Theory of Machine
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Not sound
Data is not sufficient to determine same
Kinematically sound
Soundness would depend upon which link is kept fixed

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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 centrifugal acceleration
The centre of the disc has zero acceleration
The point on the disc making contact with the plane surface has zero acceleration

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