Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials
Very serious in ductile materials and less serious in brittle materials
Seriousness would depend on other factors

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Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Retain deformation produced under load permanently
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed

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Machine Design
Castle nut is a locking device in which

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 spitted and bent in reverse direction at other end
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly is middle of nut and then slot reduced by tightening a screw

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