Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
4F/ πd²
16F/ 3πd²
6F/ πd²

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

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Machine Design
Split nut is a locking device in which

A slot is cut partly in middle of nut and then slot reduced by tightening screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
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 the other end
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

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