Machine Design
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

Ductility
Elasticity
Malleability
Plasticity

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
Grease required to be applied after some intervals

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Machine Design
Elastic nut is a locking device in which

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
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
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

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