Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Static loading
Dynamic loading
Completely reversed loading
Combined static and dynamic loading

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Machine Design
Elastic nut is a locking device in which

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
A slot is cut partly in middle of nut and then slot reduced by tightening a screw
One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

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Machine Design
A bolt of uniform strength can be developed by

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

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