Machine Design
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

Sum of the initial tension and external load applied
Initial tension or external load, whichever is greater
Initial tension
External load applied

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Machine Design
Crowning on pulley helps

To increase pulley life
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

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