Machine Design
The resultant axial load on a bolt depends on

All of these
External load applied
Relative elastic yielding (springness) of the bolt and the connected member
Initial tension

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

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