Theory of Machine
Open pairs are those which have

Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Two elements that permit relative motion

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication
Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles

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Theory of Machine
Which of the following property of the instantaneous center is correct?

All of these
The two rigid links have no linear velocity relative to each other at the instantaneous centre.
The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.

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