Theory of Machine
The motion between a pair which takes place in ____ is known as incompletely constrained motion.

Two directions only
More than one direction
One direction only
None of the listed here

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Theory of Machine
In gears, interference takes place when

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
Pitch of the gears is not same
Gear teeth are undercut

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