Machine Design
Basic hole is one

Whose lower as well as upper deviations are zero
Whose upper deviation is zero
Does not exist
Whose lower deviation is zero

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Machine Design
A bolt of uniform strength can be developed by

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

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