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

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

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is directly proportional to the normal force.
All of these
The friction force is dependent on the materials of the contact surfaces.
The friction force is independent of me area of contact.

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