Machine Design
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

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

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

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