Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Tip of the gear and flank of pinion
Tip of both gear and pinion
Flanks of both gear and pinion
Tip of the pinion and flank of gear

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Machine Design
In case of V belt drive

The belt should touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
The belt should not touch the bottom of groove in the pulley
None of these

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