Machine Design
The resultant axial load on a bolt depends upon

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of these
The tensile stresses are uniformly distributed over the section of the walls
The effect of curvature of the cylinder wall is neglected

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