Theory of Machine
A chain comprises of 5 links having 5 joints. Is it kinematic chain?

Data are insufficient to determine it
Yes
It is a marginal case
No

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Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
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

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

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