Theory of Machine
Which of the following is an example of a higher pair?

Ball and roller bearing
All of the listed here
Belt and rope drive
Toothed gearing

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Theory of Machine
In gears, interference takes place when

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
Gear teeth are undercut

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