Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

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

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Machine Design
Turn buckle has

Right hand threads on bout ends
No threads
Left hand threads on one end and right hand threads on other end
Left hand threads on both ends

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