Machine Design
The resultant axial load on a bolt depends upon

Initial tension due to tightening of the bolt
All of these
Relative elastic yielding of the bolt and the connected members
External load applied

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Machine Design
Crowning on pulley helps

To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
In increasing the slip of the belt
To increase pulley life

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