Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.5
2.5
3
2.8

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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
One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
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

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Machine Design
The face of the tooth is the

Surface of the top of the tooth
Width of the tooth measured along the pitch circle
Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface

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