Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
None of these
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

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Load required to produce unit deflection
Its capability of storing energy
Ratio of coil diameter to wire diameter

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