Machine Design
A sliding bearing which operates without any lubricant present, is called

Zero film bearing
Boundary lubricated bearing
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing

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

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

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