Machine Design
The distribution of the forces along the length of key fitted in a shaft

Varies linearly
Varies exponentially, being more near the torque-input end
Varies exponentially, being less near the torque-input end
Is uniform throughout

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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 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

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